Multi-plate type heat exchanger

The utility model relates to a heat exchange device, in particular to a multi-plate heat exchanger, which comprises at least three heat exchange sheets, a cover equipped at the top of the heat exchange sheets, a base equipped at the bottom of the heat exchange sheets, and a washer arranged between the two adjacent heat exchange sheets, all the parts being fastened and sealed by fastening bolts. The heat exchange sheet is a sealed assembly consisting of two disc-shaped heat exchange plates and a circumferential edge on which an inlet/outlet port is equipped to communicate with the interlayer therebetween. One of the two adjacent heat exchange sheets has a through hole in the center, isolated from the interlayer, and the other one has at least three through holes closely to the circumferential edge, all isolated from the interlayer. The utility model has the advantages of large cross-sectional area of the gas passage, uniform distribution of the cooling surfaces, large flow rate of the water passage, excellent planeness of the flange surface due to the mechanical processing, and no leakage under vacuum or increased pressure.