The invention discloses a spraying device for an automobile sheet metal part, and relates to the technical field of automobile sheet metal part processing. The spraying device comprises a device pedestal, a controller, a servo motor, a planetary gear transmission mechanism, spraying components, lead screw transmission assemblies and electric clamping claws, wherein the device pedestal consists ofa bottom plate, stand columns and a waste box; the controller is fixedly mounted at the side ends of the stand columns; the servo motor is fixedly mounted on the center of the bottom plate; the planetary gear transmission mechanism consists of a planet carrier, a gear ring, a solar wheel and planet wheels; the center of the solar wheel is fixedly connected with the output shaft of the servo motor;the planet wheels are in engaged connection with teeth of the solar wheel, and are also in engaged connection with teeth of the gear ring; fixed lugs are symmetrically arranged outside the gear ring;the lead screw transmission assemblies are fixedly mounted on the fixed lugs; each spraying component consists of a liquid pump liquid storage box, a hose and a spray head; and the electric clampingclaws are symmetrically and fixedly mounted at the upper end of the waste box. The spraying device for the automobile sheet metal part disclosed by the invention is used for simultaneously spraying the two side surfaces of the automobile sheet metal part, greatly improves spraying efficiency, and guarantees spraying quality.