Low-temperature-resistant plate heat exchanger

The low-temperature-resistant plate heat exchanger comprises a first limiting plate, a heat exchange plate and a second limiting plate, a water inlet is formed in the outer side wall of the second limiting plate, the water inlet end of the water inlet is detachably connected with a filtering assembly through a bolt, and the filtering assembly comprises a filtering cylinder, a filtering net, a brush plate, a collecting bottle, a threaded opening and a connecting column. The filter screen is detachably connected to the interior of the filter cartridge, the brush plate is arranged on the outer side surface of the filter screen, the filter screen opening is formed in the lower surface of the filter cartridge, a connecting column is fixedly connected to the top end of the collecting bottle, and the collecting bottle is in threaded connection with a threaded opening formed in the lower surface of the filter cartridge through the connecting column. By arranging the cleaning structure, the filtering mechanism in the