▎ 摘　　要

NOVELTY - A film-coated extruded polystyrene board comprises extruded polystyrene board and functional film adhered to the surface of the board. The functional film is graphene oxide or its derivative. USE - Film-coated extruded polystyrene board. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the film-coated extruded polystyrene board comprising cleaning extruded polystyrene board, drying, adding to reaction vessel, reacting with methanol vapor at 35 degrees C for 30-50 minutes, and discharging; and ultrasonically dispersing graphene oxide or its derivative in dispersion medium to obtain 0.5-5 mg/mL graphene oxide or its derivative solution, heating to 65-80 degrees C, quickly adding treated extruded polystyrene board, heating to 65-80 degrees C for 0.5-2 hours, taking out, washing for 2-3 times with water, and drying.