Plate type heat-exchanger

The utility model provides a plate type heat exchanger for the exchange of cold and hot medium in the fields of heating, metallurgy, petroleum, chemistry, paper making and the like. The heat exchanger is provided with plate sheets, the cross-section of each plate sheet is wavy, and a medium heat exchange runner which is composed of the plate sheets is oblique, transverse or longitudinal. Compared with the prior art, the utility model has the advantages of simple and reasonable structure design, simple, convenient and feasible making process, convenient and reliable installation, use and cleaning, avoidance of flowing dead area, increase of medium contact area, effective improvement of heat exchange efficiency, stable and reliable working performance, high pressure resistance, long service life, saving of metal material consumption, reduction of production cost, improvement of enterprise benefits and the like, and is suitable for popularization and application in the industry.