Large groove cutting device for pipe

The embodiment of the invention provides a pipe large groove cutting device which comprises a cutting working platform, a driving device is installed on the cutting working platform, and the driving device drives a fixed transmission roller arranged on the cutting working platform through a transmission device; the pipe size adjusting device is arranged on the cutting working platform, the pipe size adjusting device comprises an adjustable roller, and the width of the fixed transmission roller and the width of the adjustable roller on an adjustable roller groove are adjusted according to the size of a workpiece to be cut; and the bottom end of the fixing device is fixedly connected with the cutting platform through a fixing piece, the bottom end of the fixing device moves in the cutting position adjusting groove, the upper end of the fixing device is connected with a cutting gun through a clamping device, and the clamping device can move up and down on the fixing device for adjustment. 本发明实施例提供了一种管子大坡口切割装置，包括