Pipe feeding device of polishing machine

The utility model relates to a pipe feeding device of a polishing machine, which comprises an outer support component, a pipe feeding component and a pipe feeding component, the inner supporting assembly is mounted in the outer supporting assembly in a sliding manner; the inner supporting assembly comprises an inner support, a plurality of sliding blocks, a V-shaped carrying plate, a limiting column, an air cylinder and a rack. The inner support is contained in the outer support, and the sliding block is connected with the guide rail in a matched mode. The air cylinder is used for driving the V-shaped carrying plate to turn over. The side, away from the hinge point, of the V-shaped carrying plate abuts against the limiting column. The rack is matched and meshed with the gear. The pipe feeding device of the polishing machine is simple in structure and convenient to use, the inner support is slidably connected with the outer support, after the V-shaped carrier plate loads a large metal pipe fitting, the driving