High temperature grain deduster

The invention discloses a high temperature grain deduster. The high temperature grain deduster comprises an air compressor, the air compressor is connected with an ash feeding hopper, the ash feeding hopper is connected with a dedusting box, an air inlet is arranged between the ash feeding hopper and the dedusting box, a movable granule bed is arranged in the dedusting box, a wind distribution plate is arranged at the lower end of the movable granule bed, the upper end of the dedusting box is connected with an ash remover, the lower end of the dedusting box is connected with a cooler, the movable granule bed comprises substrates, a plurality of layers of filter material granules are arranged between the substrates in a mutual interlaced manner, sealing end caps are arranged at two ends of the substrates, every sealing end cap is provided with a slide wheel, and every slide wheel is connected with a slide track. High temperature coal gas is filtered through the movable granule bed, and the cross-flow structure