Steam air preheater for garbage incinerator

The utility model discloses a steam air preheater for a garbage incinerator, and relates to the technical field of preheaters, the steam air preheater for the garbage incinerator comprises a preheating box, the surface of the preheating box is connected with a movable box cover in a sliding mode, heat exchange pipes which are arranged at equal intervals are fixedly installed in the movable box cover, and the heat exchange pipes are connected with the movable box cover in a sliding mode. A placing plate is fixedly connected to the inner wall of the preheating box, placing grooves arranged at equal intervals are formed in the surface of the placing plate, the inner walls of the placing grooves are slidably connected with the surfaces of the heat exchange pipes, and cleaning mechanisms are arranged in the placing grooves. Through the arrangement of the cleaning mechanism, a worker only needs to start a hydraulic telescopic rod back and forth, dust on the inner wall of the heat exchange pipe can be brushed off, a