The invention discloses a hard alloy pipe fitting. The hard alloy pipe fitting comprises a base. Supporting frames are symmetrically and fixedly arranged on the top end surface of the base left and right. A main seat body is arranged between the supporting frames on the left and right sides. A first sliding cavity is arranged in the bottom end surface of the main seat body. A mounting seat is installed in the first sliding cavity in a sliding fit manner. A buffer spring is installed between the top end surface of the mounting seat and the top wall of the first sliding cavity in an abutting fitmanner. A first concave cavity is formed in the bottom end surface of the mounting seat. A first transmission cavity is arranged in the portion, on the upper side of the first concave cavity, of themounting seat. A first rotating shaft is rotatably arranged between the first concave cavity and the first transmission cavity in a matched mode. A first bevel gear is fixedly arranged at the tail endof the top of the first rotating shaft. A mounting block is fixedly arranged at the tail end of the bottom of the first rotating shaft. An insertion cavity is formed in the bottom end surface of themounting block.