Pressure gauge with protection function

The utility model discloses a pressure gauge with a protection function, which comprises a bottom plate, and mounting blocks are fixedly mounted on two sides of the top of the bottom plate through bolts. A protective shell is inserted into the inner sides of the two U-shaped limiting plates, the protective shell extrudes a bevel edge clamping block to move outwards through a second bevel edge of the bevel edge clamping block, the bevel edge clamping block moves to drive a movable plate to move, the movable plate moves to drive a guide sleeve to slide on the surface of a guide rod, and the guide sleeve moves to extrude a second abutting spring; when the bevel edge clamping block moves to the position of the bevel edge clamping groove, the movable plate, the pull rod, the pull plate, the guide sleeve and the bevel edge clamping block are reset through the elastic force of the first abutting spring and the second abutting spring, and the bevel edge clamping block is reset and clamped into an inner cavity of the