Pipeline explosion-proof device

The invention relates to the technical field of hydraulic power plant pipeline safety, in particular to a pipeline explosion-proof device which comprises an opening and closing assembly, the opening and closing assembly comprises a containing box, a valve body, a second communicating pipe, a supporting piece, a lifting matching piece and a mounting piece, the valve body is arranged in the containing box, the second communicating pipe is connected with the valve body, and the supporting piece is arranged in the containing box; the supporting piece is connected with the second communicating pipe, the lifting matching piece is matched with the supporting piece, the mounting piece is arranged at the bottom of the containing box, the interior of the pipeline can be exhausted through the opening and closing assembly when the pressure of the pipeline exceeds a rated value, and the pipeline can be sealed after exhausting is conducted till the pressure in the pipeline reaches a normal pressure value. The pressure in t