Piezoelectric sensor

The utility model discloses a piezoelectric sensor which structurally comprises a shell, a connecting end, a base, a fixing ring, a gasket, a conductive terminal, a pre-tightening piece and a piezoelectric element, a rapid connecting device is arranged at the lower end of the outer surface of the connecting end, a pull ring applies pull force to the pull ring, the pull ring drives a movable rod tomove through a movable mechanism, and the movable rod drives a clamping plate to move. When the external connecting end is inserted, the pull ring is loosened, the first spring drives the clamping plate to reset, so that the clamping plate abuts against the outer surface of the external connecting end, the effect of quickly connecting the connecting end is achieved, and the pull ring drives the movable plate to move by applying a pull force to the pull ring through arranging the movable mechanism at the right end in the shell. The movable shell slides on the inner side face of the sliding groove through the movable p