The invention discloses a welding clamp for a cushion frame of a sixty-percent seat. The welding clamp is characterized by comprising a base plate used for placing parts of the cushion frame of the seat; and a frame pipe positioning mechanism, a seat front supporting steel wire positioning mechanism, a connecting arm positioning mechanism and a connecting support hole positioning base are arrangedon the base plate. The welding clamp for the cushion frame of the sixty-percent seat has the advantages that the parts can be independently positioned and clamped, the positions are reasonably distributed, the stress balance can be guaranteed, steel wires can be conveniently positioned, the supporting effect after the steel wires are welded can be guaranteed, and meanwhile, connecting arms and connecting supports are positioned through a hole so that the accuracy of hole positioning can be guaranteed.