Automatic pipe cutting device and pipe cutting method

The invention provides an automatic pipe cutting device and method, and relates to the technical field of steel pipe cutting. The fixed cutting board is rotationally connected to the upper end of the rack, a first rotating source is fixedly connected to the joint of the fixed cutting board and the rack, and the first rotating source is used for driving the fixed cutting board to rotate; the multiple rotating mechanisms are arranged on the mounting frame, and the rotating mechanisms are driven by the air cylinders to drive the steel pipes to be close to the fixed cutting board; the air cylinder is fixedly connected to the interior of the rack, a driving shaft of the air cylinder extends out of the rack, and the air cylinder is used for driving the rotating mechanism to be close to the fixed cutting board; and the fixing mechanism is arranged above the rotating mechanism, and the fixing mechanism is used for fixing the steel pipe on the rotating mechanism. The problem of deflection caused by repeated movement o