The utility model discloses a compound plank of fire -retardant radiation protection type carbon fiber of phosphinylidyneization, for the board layer structure body of minute body structure, through adopting alkali lye submergence preliminary treatment with ordinary plank I, hardwood board and ordinary plank II, phosphinylidyne processing and drying are docile and obedient the preface and are incited somebody to action ordinary plank I through first wood glue layer with the compression joint of radiation protection structural layer, the radiation protection structural layer through first fire-retardant radiation protection adhesive layer with the fibre layers compression joint, fibre layers pass through the fire -retardant radiation protection adhesive layer of second with the hardwood plate voltage closes and is formed by connecting, the hardwood board pass through second wood glue layer with II compression joints of ordinary plank. The utility model discloses a fire -retardant radiation protection of compound plank is compared with general ordinary plank, and fire -retardant ability has increased by 126~168%, capability of the radiation protective and has increased by 139~174%,mechanical strength to have increased by 24~49%, application scope wide.