The utility model discloses a pipe opening closing device, and belongs to the technical field of material forming. The pipe opening closing device comprises a pipe fixing device, a pipe speeder, an opening closing device seat 13 and a rolling mill 12, wherein a pipe 3 penetrates through the fixing device, the pipe speeder and the rolling mill 12, the fixing device is sleeved on a bearing seat and is fixed on an opening closing device seat 14 through a bearing seat support, and the rolling mill 12 is fixed on the opening closing device seat 13 through a roller support. The pipe opening closing device has the advantages that forming speed is fast, heat pipe raw material is saved, a heat pipe end opening position transition is smooth, surface is smooth, tube wall thickness of the end opening position is not reduced, heat pipe forming rate is high, physical and chemical performances of heat pipe end opening position material are not changed and the like. The pipe opening closing device is especially suitable for heat pipe integral forming, and can effectively prevent electrochemical corrosion caused by heterogeneous metal connection and welding end opening burst by connection in weld mode.