The utility model provides an explosion -proof trigger sealing device that scrapes, it includes the tail cavity, the sliding plate, side seal chamber, the bearing frame, there is PMKD in the both sides welding of tail cavity, the last cross slot that is equipped with of PMKD, there is the indent tang embedding that suits with the cross slot width sliding plate inboard in the cross slot, the outer border that the sliding plate medial surface is in the tang is equipped with the ring packing groove, set up seal gasket at this ring packing inslot, the laminating of sliding plate medial surface is on the PMKD lateral surface, and it screws on the screw on PMKD with sliding plate and PMKD fastening together to have a plurality of bolts to correspond the slide opening that passes on the sliding plate respectively, the both sides of tail cavity are provided with and hold PMKD, the sliding plate, the side seal chamber of bearing frame. The utility model discloses improve the sealing performance of scraper conveyor tail cavity, made the product have safe high -efficient reliable characteristics, be particularly suitable for being used for containing the transport of the material of inflammable and explosive solvent.