Plate heat exchanger automatic flushing system

The utility model relates to the technical field of automatic flushing of sewage treatment plate heat exchangers. The invention relates to a washing system, in particular to a plate heat exchanger automatic washing system. Plate heat exchanger, a nitrification sludge pipe and a water pipe are arranged in the plate heat exchanger; wherein a digested sludge pipe at the upper end of the left side ofthe plate heat exchanger is communicated with a sludge inlet pipe; a sludge digestion pipe at the lower end of the right side of the plate heat exchanger is communicated with a sludge outlet pipe; a right upper end water pipe of the plate heat exchanger is communicated with a cooling inlet pipe; a left lower end water pipe of the plate heat exchanger is communicated with a cooling outlet pipe; a cleaning pipe is arranged between the sludge inlet pipe and the cooling inlet pipe; an electromagnetic valve E is arranged on the cleaning pipe; the sludge inlet pipe is provided with an electromagnetic valve A, the cooling in