The invention discloses an equipment clamp for assembling a passenger carriage body. The clamp comprises a clamp body, a guide rail, a sliding component and an air cylinder driving unit, the sliding component is slidably connected to the guide rail, one end of the sliding component is fixedly connected with the clamp body, the clamp body comprises a first clamping arm and a second clamping arm, one end of the second clamping arm is fixedly connected with the sliding component, the other end of the second clamping arm is hinged to the first clamping arm, a fixing bracket is hinged to the lower tail end of the second clamping arm, the air cylinder driving unit is welded to the fixing bracket, a driving shaft of the air cylinder driving unit is hinged to the first clamping arm, the first clamping arm and the second clamping arm are driven by the air cylinder driving unit to be clamped, the upper side wall and the lower side wall of the guide rail are sunken for forming first sliding guide grooves provided with sliding guide side walls respectively, the sliding component comprises a connection plate, extension plates and slide blocks which are parallel to the connection plate, a second sliding guide groove is formed between the connection plate and each slide block, one end of the second clamping arm is fixedly connected to the connection plate, and when the slide blocks are slidaly located in the first sliding guide grooves, the sliding guide side walls of the first sliding guide grooves are located in the second sliding guide grooves of the sliding component.