An automatic hydraulic numerical control pipe bending machine, mainly composed of a bed, an industrial computer, a displacement sensor, a Y cylinder, a photoelectric encoder, X, Y servo valves, a hydraulic servo system, an X cylinder, a feeding bracket, a moving wheel, and a fixed roller , It is composed of a roller, a rectangular tube, a lifting bracket, a slide rail, a core holder and a core holder bracket. The successful application of the fully automatic hydraulic CNC pipe bender has greatly reduced the workload of shape correction and the difficulty of quality control of the corresponding assembly in the follow-up process. The position control accuracy and fast dynamics of the Y oil cylinder should be the key to ensure the bending accuracy. The X cylinder of the pipe bending machine adopts hydraulic servo speed control, and the Y cylinder adopts hydraulic servo position closed-loop control, which can meet the processing accuracy requirements of vehicle pipe fittings.