Plate type water supply preheater

The invention discloses a plate-type water supply preheater, and particularly relates to the technical field of plate-type preheaters. A protective shell is arranged at the upper end of a placement shell, a water inlet is formed in the middle of the left end of the protective shell, a water outlet is formed in the middle of the right end of the protective shell, and the placement shell is fixedly connected with the lower end of a cleaning device; a through groove is formed in the rear portion of the upper end of the protective shell, a heat dissipation device is arranged on the rear portion of the baffle, and the heat dissipation device is connected with the through groove and the heat dissipation groove in a sliding mode. According to the plate type water supply preheater, the distance between the multiple heat exchange plates can be adjusted through the arranged heat dissipation device, so that dust on the outer surfaces of the heat exchange plates is fully treated, meanwhile, the cleaning device is started