Return sealing device for conveying belt

The utility model relates to the technical field of material conveying, in particular to a return sealing device for a conveying belt, which enables materials attached to the conveying belt to be cleaned into a cavity of a material collecting box by a scraper blade and a plurality of groups of brushes during return and avoids waste of raw materials and influence on the working environment of a workshop due to the fact that the materials directly fall onto the ground. The reliability and the practicability of the belt conveyor in the using process are improved; comprising a bottom plate, a material collecting box, a scraping plate, a rotating shaft, multiple sets of connecting plates, multiple sets of brushes, a first motor, a supporting plate and a lifting device, the material collecting box is fixedly installed at the upper end of the bottom plate, a cavity is formed in the material collecting box, an opening is formed in the upper end of the material collecting box, the material collecting box is located be