Kiln air preheating device

The utility model relates to the technical field of kilns, in particular to a kiln air preheating device which comprises a kiln body, a first collecting chamber is arranged outside the kiln body, and a preheating assembly is installed on one side of the first collecting chamber. A smoke exhaust pipe is inserted into the top of the furnace body, a filter cavity is inserted into one end of the smoke exhaust pipe, a filter element is slidably connected into the filter cavity, and a smoke guide pipe is inserted into the top of the filter cavity; the first collecting chamber comprises a sealing door, the side face of the first collecting chamber is fixedly connected with a connecting pipe and an improved preheating device, hot air around the furnace body is recycled through the first collecting chamber, discharged hot smoke is recycled and filtered through a smoke guiding pipe and a filtering cavity, the heat recycling efficiency around the furnace body is improved, and the heat recycling efficiency of the furnace