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Microwave synthesis has many advantages covering rapid, high-efficient, environmentally-friendly <i>etc</i>. Herein, graphene-like carbon nitride nanosheets (g-C₃N₄-NS) were successfully prepared by high-energy microwave heating method using melamine and carbon fibers as precursor and microwave absorber, respectively. The as-synthesized samples were investigated <i>via</i> various analytic techniques including X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and fourier transform infrared spectroscopy (FT-IR). Results show that the g-C₃N₄-NS sample prepared by microwave heating exhibits the obvious feature of graphene-like ultra-thin nanosheets in comparison with sample synthesized by conventional thermal polycondensation. Meanwhile, compared with graphene-like carbon nitride nanosheets prepared by other approaches including ultrasonic exfoliation and oxidation etching methods, the sample synthesized by microwave heating has smooth, flat and strong rigidity surface.