Plate heat exchanger with good sealing performance

The utility model discloses a plate heat exchanger with good leakproofness, which comprises a front end plate, a rear end plate, corrugated heat exchange plates and copper pipe joints arranged around the front end plate, a single group of corrugated heat exchange plates comprises a first plate and a second plate which are laminated, and a duct for medium circulation is arranged between the first plate and the second plate. The copper pipe connector is welded to the front end plate, the outer side of the copper pipe connector is sleeved with a TPV sealing sleeve, the TPV sealing sleeve comprises a lower sleeve part and an upper sleeve part, the lower sleeve part and the upper sleeve part are arranged in a stepped mode, and protruding edges are densely distributed on the outer wall of the upper sleeve part at intervals and vertically arranged. Annular pressing grooves are formed in the abutting corner holes of the first plate piece and the second plate piece, and the first plate piece and the second plate piece