Pipeline thinning and tooth opening device

The utility model discloses a pipeline thinning and thread opening device which comprises a machine frame and an expansion rotating device installed on the machine frame, and is characterized by further comprising an inner thread translation device, an outer thread translation device, an inner thread cutter and an outer thread cutter, the inner thread translation device and the outer thread translation device are installed on the machine frame side by side, and the inner thread cutter and the outer thread cutter are installed on the machine frame side by side. The internal thread cutter is mounted at the power output end of the internal thread translation device, and the external thread cutter is mounted at the power output end of the external thread translation device; the blade point of the internal thread cutter is in contact fit with the inner side wall of one connecting port of the pipeline on the expansion rotating device, and the blade point of the external thread cutter is in contact fit with the oute