Novel metal pipeline welding opening grinding device

The utility model discloses a novel metal pipeline welding opening grinding device which comprises a frame body, the upper side of the interior of the frame body is rotationally connected with a first threaded rod, one side of the upper end of the frame body is fixedly provided with a first driving assembly used for driving the first threaded rod to rotate, and one end of the first threaded rod is provided with a moving assembly used for grinding; a fixed plate is fixedly connected to the middle of one side of the frame body, a circular groove is formed in the middle of the fixed plate, a first groove is formed in the inner side wall of the circular groove, and a first threaded rod, a first threaded sleeve, a movable plate, a second threaded rod, a second threaded sleeve, a rotating wheel, a rack, a carrier gear, a high-speed gear and other structural components are arranged; the welded pipeline is fixed to the inner side of the rotating wheel through the clamp, then the first motor and the third motor are dr