The plate heat exchanger is a new type of high-efficiency heat exchanger which is assembled from a series of metal sheets with a certain corrugated shape. The plate is made of various materials and pressed into various shapes and different corrugatioms with various types of abrasive tools., and four corner holes on the plate are used for themdeium flow path. The periphery of the plate and the corner hole are sealed with a rubber gasket. The frame is composed of a fixed pressing plate, a movable pressing plate, upper and lower guide bars, and clamping bolts. It has the characteristics of large logarithmic mean temperature difference and small temperature difference at the end, small footprint, easy cleaning, small heat loss and easy change of heat exchange area or process combination.