The invention relates to a microwave chromogenic high strength composite material and a preparation method thereof. The composite material comprises a shielding layer, a color developing layer and a reinforcing layer that are laminated and connected in order. The shielding layer is a paraffin-coated glass fiber fabric or light-colored chemical fiber fabric; the color developing layer is a fabric woven from the fiber of a wave-absorbing material coating, or a fabric of the wave-absorbing material coating; the reinforcing layer is light-colored high strength fiber or light-colored high strengthfiber fabric, the shielding layer, the color developing layer and the reinforcing layer are laid in order and then compounded with epoxy resin so as to obtain the microwave chromogenic high strength composite material. When the composite material is subjected to microwave irradiation, the wave-absorbing layer absorbs microwave and heats the composite material to 60DEG C or above, the white paraffin of the shielding layer becomes transparent after melting, so that the color or pattern of the color developing layer shows up. After microwave irradiation is turned off, the paraffin solidifies, andthe composite material restores to white, thus realizing the microwave chromogenic composite material. The microwave chromogenic high strength composite material provided by the invention is simple and feasible, and can be widely applied in electronic product shells, advertising industry and other fields.