Automatic pipe cutting machine convenient to fix

The automatic pipe cutting machine convenient to fix comprises an operation table, a plurality of sets of grooves are formed in the positions, on the upper end face of the operation table, of the front portion and the rear portion of a pipe body, first springs are fixedly arranged in the grooves, the other ends of the first springs are connected with a first limiting plate, and the pipe body is placed below the first limiting plate. According to the automatic pipe cutting machine convenient to fix, a first limiting plate is semicircular, and the first limiting plate and a pipe body form an extrusion limiting structure through a first spring and an operation table, so that the pipe body is extruded and limited through the first spring and the first limiting plate; a fixed rod of the device and a pipe body form a vertical lifting structure through a telescopic arm under the action of an electric push rod, and a hook and a fixed block form a limiting sliding structure through a screw rod, a sliding rod and a mov