The invention discloses a car body lifting appliance capable of being automatically opened. The car body lifting appliance capable of being automatically opened comprises a lifting frame, a chain wheel mechanism and lifting arms symmetrically arranged at the left side and the right side of the lifting frame, wherein the chain wheel mechanism is fixedly arranged at the middle part of the lifting frame; limit clamping block bases, press-off arm bases and cam bases are symmetrically and fixedly arranged on the lifting frame, and between the two sides of the chain wheel mechanism and the two endsof the lifting frame in sequence; a press-off arm is arranged on each press-off arm base, the low end of each press-off arm is hinged to the corresponding press-off arm base, a limit rod is arranged at one side of each press-off arm, the other end of the limit rod is slidably connected with the corresponding limit clamping block base, and a cam control rod is arranged at the other side of each press-off arm; and a cam is arranged on each cam base, the low end of each cam is fixedly connected with the top end of the corresponding lifting arm, and the other end of the cam is hinged to the corresponding cam control rod. The car body lifting appliance capable of being automatically opened is simple in structure, and capable of being transformed on the basis of the existing car body lifting appliance; and moreover, the opening-closing reliability of the car body lifting appliance is ensured, the energy consumption is reduced, the use cost is lowered, and the economic expense is saved.