The invention relates to a sealing device for a material bucket capable of stirring concrete. The sealing device comprises a bucket body, wherein a stirring shaft driven by a hydraulic motor is rotatably mounted in the bucket body, an intermediate impeller is fixedly installed in the middle of the stirring shaft, a left spiral blade and a right spiral blade which are opposite to each other in rotation direction are arranged on the two sides of the intermediate impeller correspondingly, bearing boxes are mounted on the two side walls of the bucket body correspondingly, bearing chambers are arranged in the bearing boxes correspondingly, bearings are installed in the bearing chambers, the stirring shaft is mounted on the bearings, and the hydraulic motor is located on the outer side of the bucket body and is mounted on the bearing boxes. The device has the following effects that 1), a double oil seal structure of a framework oil seal and a mechanical seal assembly is adopted, the sealingcapability of the product in a harsh environment is improved, and the service life of the product is prolonged; 3), an impeller cover is in a frustum shape, materials can be prevented from being bonded to a mechanical seal box, cleaning is convenient, secondary sealing can be carried out on the mechanical seal box, and the sealing effect is improved.