The utility model discloses a revolving body supporting wheel of a sterilization kettle. The device comprises a fixed shell and a central shaft, a plurality of bearings are arranged between the fixedshell and the central shaft; fixing covers are arranged at the two ends of the fixing shell correspondingly. A first framework sealing ring and a second framework sealing ring which are independent ofeach other are arranged between each fixing cover and the center shaft in an interference fit mode. A boss is arranged between the first framework sealing ring and the second framework sealing ring,the boss is fixedly connected with the fixing cover, and the boss, the center shaft and the framework sealing rings on the two sides of the boss jointly form a closed containing cavity. The supportingwheel has the advantages that the waterproof effect can be improved under the condition that the assembling efficiency is guaranteed, and therefore the service life of the supporting wheel is prolonged.