The automatic welding tube cutting machine is used together with the welding tube forming machine, it uses the highly reliable servo motor control system to complete the function of the tractor. The pipe speed is steplessly adjusted within the range of 1-150M per minute. The length of the inlet pipe is measured by high-precision rotary coding, and the measurement accuracy can reach 0.05mm. The control system uses Siemens PLC programmable control, with a powerful 320-240 touch screen to display and set various information. It can conveniently complete the function setting and execution of the pipe cutting machine running speed, pipe cutting length and number of cut pipes.