Backrest folding joint for wheelchair

The utility model relates to the technical field of wheelchairs, and discloses a backrest folding joint for a wheelchair, which comprises a rotating component connected with a backrest frame of the wheelchair and a fixing component connected with a seat frame of the wheelchair, a clamping piece is elastically and rotationally arranged on the rotating assembly, a clamping groove is formed in the bottom of the clamping piece, a second shaft pin matched with the clamping groove in a clamping mode is fixedly installed on the fixing assembly, a third shaft pin is fixedly installed on the clamping piece, and a limiting plate is fixedly installed on the fixing assembly; the limiting plate is located between the fixing assembly and the rotating assembly. According to the backrest folding joint for the wheelchair, the wheelchair in a folded state can be locked, and the backrest frame and the seat frame cannot rotate relatively, so that the situation that the wheelchair stretches when the folded wheelchair is carried i