The invention discloses a vehicle-mounted folding light-tracing solar panel power generation device, and belongs to the technical field of power generation of new energy vehicles. In the vehicle-mounted folding light-tracing solar panel power generation device, a base assembly is fixedly connected at the center of a vehicle roof; a box body is formed by fixedly connecting a front plate, a back plate, a left plate and a right plate; a rotating base is hinged to the box body through two hinges; one end of an electric push rod assembly is hinged to the box body; the other end of the electric push rod assembly is hinged to the rotating base; a solar panel assembly II is connected with an upper sliding slot L in a sliding manner; a solar panel assembly I is connected with a middle sliding slot M in a sliding manner; a solar panel assembly III is connected with a lower sliding slot N in a sliding manner; a detection module is fixedly connected at the center of the front surface of a top solar panel; an intelligent controller is fixedly connected on the rotating base; the vehicle-mounted folding light-tracing solar panel power generation device inputs signal through the detection module, processes the signal through the intelligent controller and executes operation through a step motor assembly and the electric push rod assembly; the vehicle-mounted folding light-tracing solar panel power generation device can significantly increase the sunlight receiving area and the receiving efficiency of the vehicle roof of a solar vehicle, and choose different light-tracing strategies according to different weather conditions, so that the light-tracing accuracy is greatly improved.