Plug capable of relieving pressure

The embodiment of the utility model provides a plug capable of relieving pressure. The plug capable of relieving pressure comprises a plug shell and a plug cap. One end of the plug shell is provided with a first pressure relief hole, a sealing elastic piece is arranged on the first pressure relief hole, an elastic component is arranged inside the plug shell and is connected with the sealing elastic piece. At least one second pressure relief hole is formed in the plug cap, one end of the plug cap is detachably connected with one end of the plug shell, the other end of the plug cap is a seal bottom, and inward protrusions are arranged on the seal bottom. The plug capable of relieving pressure achieves convenient installation, airtight detection and simple pressure relief, saves working hours and is free of manual operation risks. Especially for plugs installed at the tail ends of high-pressure devices, no personal injury is caused to operators in the process of conducting airtight detection and pressure relief.