The invention relates to a turnover box in the cargo transportation logistics industry, in particular to a detachable sealed pallet turnover box which can automatically discharge material. The turnover box comprises a bottom plate, a cover plate and four side wall plates, the bottom plate, the cover plate and the four side wall plates are connected and installed to form a hollow cuboid-shaped box, the bottom plate is a pallet type bottom plate, and nine downward supporting columns are distributed on the lower surface of the bottom plate in a matrix mode. The nine supporting columns are hollow. The nine supporting columns upwards penetrate through the bottom plate and are communicated with the box, and discharging mechanisms are installed inside the nine supporting columns and used for discharging the cargoes. The turnover box has the advantages that the bottom plate of the pallet type structure is adopted for the turnover box, which helps a forklift or other transferring tools to transfer, lift and discharge the turnover box, so that labor intensity is relieved; meanwhile, the discharging mechanisms are arranged, so that automatic discharging is achieved, the structure is simple, installing and detaching are convenient, the turnover box is convenient to return in an empty mode after detaching, transportation cost is reduced, repeated recycling can be achieved, and economic benefits are improved.