Quick connecting pipe fitting

The utility model provides a quick connecting pipe fitting, and belongs to the technical field of pipe fitting connection. The problem that an existing quick connecting pipe fitting necks, cracks and the like is solved. The quick connecting pipe fitting comprises a sleeve and a body with a connecting hole, a sealing ring, a back cushion and a clamping spring are sequentially arranged in the connecting hole from inside to outside, the clamping spring is provided with a circle of clamping teeth which are folded towards the inner side of the body and are evenly distributed in the circumferential direction, a barrel-shaped gland is further arranged in the connecting hole, and the clamping spring is axially limited between the back cushion and the gland. The inner wall of the pressing cover is provided with a blocking shoulder which protrudes inwards in the radial direction and allows a boss of the sleeve to abut against, an annular buckle which is tightly pressed on the pressing cover is arranged between the body