Auxiliary supporting structure and vehicle tail plate

The utility model relates to the technical field of vehicle tail plates, and particularly discloses an auxiliary supporting structure and a vehicle tail plate, the auxiliary supporting structure comprises a hydraulic cylinder and a rotating rod, the output end of the hydraulic cylinder is rotatably connected with a round rod, the left end and the right end of the round rod are rotatably connected with rotating blocks, and the inner ends of the rotating blocks are rotatably connected with threaded rods; the outer wall of the threaded rod is in threaded connection with a threaded cylinder, and the left and right ends of the threaded cylinder are rotationally connected with supporting rods through sliding blocks. When the vehicle tail plate needs to be supported, a hydraulic cylinder is started to drive a rotating block to rotate, the rotating block rotates to be perpendicular to the ground, then a servo motor is started to drive a threaded rod to rotate, so that a threaded barrel is driven to move, the threaded