Plate heat exchanger with automatic backwashing function

The utility model relates to the field of plate heat exchangers, in particular to a plate heat exchanger with an automatic backwashing function, which comprises a high-temperature fluid channel, a plurality of rotating rods are arranged in the high-temperature fluid channel, and two ends of each rotating rod are rotatably connected in a rotating groove on the inner wall of the high-temperature fluid channel. A plurality of sets of fan blades are fixedly connected to the middle of the rotating rod, two sets of scraping plates are installed on the rotating rod, and the high-temperature fluid channel and the low-temperature fluid channel are the same in internal structure. Therefore, the two groups of scraping plates rotate by taking the rotating rod as the center to stir and clean the inner wall of the fluid channel, solid impurities are difficult to attach and precipitate on the inner wall of the fluid channel, the electromagnetic valve I and the electromagnetic valve II can be opened or closed as required to