High-sealing booster pump with sealing assembly

The high-sealing booster pump comprises a motor and a pump body part, and the pump body part comprises a front pump body, a pressure plate assembly, a rear pump body, a diaphragm assembly, a diaphragm seat and an eccentric sleeve; the diaphragm assembly comprises a diaphragm piece and a piston push block; the diaphragm piece and the piston push block are fixed together through a bolt; a sealing assembly is arranged between the bolt and the piston push block; the sealing assembly comprises a gasket, an extrusion piece and an elastic piece. The gasket is arranged on the bolt in a sleeving manner; an extrusion notch is formed in the gasket; the extrusion part extrudes the extrusion notch to drive the elastic part to extend in the radial direction; and the elastic piece is in a contraction state and continuously applies extrusion force to the extrusion piece. According to the high-sealing booster pump with the sealing assembly, through the arrangement of the sealing assembly, sealing failure, caused by abrasion,