Inner wall polishing device of steel cylinder for gas storage

The utility model belongs to the technical field of polishing, particularly relates to an inner wall polishing device for a steel cylinder for gas storage, and aims to solve the problems that in the prior art, when the inner wall polishing device for the steel cylinder for gas storage is used for polishing the inner wall of the steel cylinder, the fixation of the steel cylinder is poor, and the steel cylinder is separated from the fixation after being used for a long time. According to the technical scheme, the device comprises a base, a supporting seat is fixedly mounted at the top of the base, a motor is fixedly mounted at the top of the base, an output shaft of the motor penetrates through the base and is fixedly connected with a first bevel gear, a grinding box is fixedly connected to the top of the supporting seat, and supporting plates are symmetrically and fixedly connected to the top of the base; the number of the supporting plates is two, a steel cylinder containing grinding materials is placed on th