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Wait a minute! I found the answer to my question!The graph line of sage plot converted to matplotlib as matplotlib.lines.Line2D object and this line has data - point coordinates for drawing it! So we can get these coordinates and draw our graph line in maplotlib figure! It's fine!!!!

import matplotlib as mpl
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid.axislines import SubplotZero

def mplot(sage_plot, equal_scale = False, edit_res = False):
    """
    This function convert sage_plot, created at sage, in matplotlib graph.
    """
    plt.clf()
    fig = plt.figure()
    ax = SubplotZero(fig, 111)
    fig.add_subplot(ax)
    L = sage_plot.matplotlib().gca().lines
    for t in L:
        data = t.get_data()
        ax.add_line(mpl.lines.Line2D(data[0], data[1]))
    ax.autoscale_view()
    if equal_scale:
        ax.axis('equal')
    for direction in ["xzero", "yzero"]:
        ax.axis[direction].set_axisline_style("-|>", size = 2)
        ax.axis[direction].set_visible(True)
    for direction in ["left", "right", "bottom", "top"]:
        ax.axis[direction].set_visible(False)
    ax.axis["yzero"].set_axis_direction("left")
    ax.minorticks_on()    
    ax.grid()
    if edit_res:
        return(fig)
    else:
        plt.savefig('')
        plt.close()

Wait a minute! I found the answer to my question!The question! The graph line of sage plot converted to matplotlib as is matplotlib.lines.Line2D object and this line has data - point coordinates for drawing it! So we can get these coordinates and draw our graph line in maplotlib figure! It's fine!!!!

import matplotlib as mpl
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid.axislines import SubplotZero

def mplot(sage_plot, equal_scale = False, edit_res = False):
    """
    This function convert sage_plot, created at sage, in matplotlib graph.
    """
    plt.clf()
    fig = plt.figure()
    ax = SubplotZero(fig, 111)
    fig.add_subplot(ax)
    L = sage_plot.matplotlib().gca().lines
    for t in L:
        data = t.get_data()
        ax.add_line(mpl.lines.Line2D(data[0], data[1]))
    ax.autoscale_view()
    if equal_scale:
        ax.axis('equal')
    for direction in ["xzero", "yzero"]:
        ax.axis[direction].set_axisline_style("-|>", size = 2)
        ax.axis[direction].set_visible(True)
    for direction in ["left", "right", "bottom", "top"]:
        ax.axis[direction].set_visible(False)
    ax.axis["yzero"].set_axis_direction("left")
    ax.minorticks_on()    
    ax.grid()
    if edit_res:
        return(fig)
    else:
        plt.savefig('')
        plt.close()

Wait a minute! I found the answer to my question! The graph line of sage plot converted to matplotlib is matplotlib.lines.Line2D object and this line has data - point coordinates for drawing it! So we can get these coordinates and draw our graph line in maplotlib figure! It's fine!!!!

import matplotlib as mpl
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid.axislines import SubplotZero

def mplot(sage_plot, equal_scale = False, edit_res = False):
    """
    This function convert sage_plot, created at sage, in matplotlib graph.
    """
    plt.clf()
    fig = plt.figure()
    ax = SubplotZero(fig, 111)
    fig.add_subplot(ax)
    L = sage_plot.matplotlib().gca().lines
    for t in L:
        data = t.get_data()
        ax.add_line(mpl.lines.Line2D(data[0], data[1]))
    ax.autoscale_view()
    if equal_scale:
        ax.axis('equal')
    for direction in ["xzero", "yzero"]:
        ax.axis[direction].set_axisline_style("-|>", size = 2)
        ax.axis[direction].set_visible(True)
    for direction in ["left", "right", "bottom", "top"]:
        ax.axis[direction].set_visible(False)
    ax.axis["yzero"].set_axis_direction("left")
    ax.minorticks_on()    
    ax.grid()
    if edit_res:
        return(fig)
    else:
        plt.savefig('')
        plt.close()

 sage: gr = plot(sin(x), x, (0, 2*pi))
 sage: mplot(gr)