The invention relates to a polishing device, in particular to a body movement mechanism of an automatic stainless steel tableware polishing machine. The body movement mechanism comprises a base, a body back-and-forth movement guide shaft, a body, a body framework, a back-and-forth movement driving mechanism, a body left-and-right movement lower guide shaft, a body left-and-right movement upper guide shaft, a lower frame, an upper frame, a left-and-right movement driving mechanism, an upper polishing mechanism and a lower polishing mechanism, wherein the back-and-forth movement driving mechanism and the body back-and-forth movement guide shaft are installed on the base, the body framework is in sliding connection with the body back-and-forth movement guide shaft and is connected with the back-and-forth movement driving mechanism, the body left-and-right movement lower guide shaft and the body left-and-right movement upper guide shaft are both in sliding connection with the body framework, the upper frame and the lower frame are respectively hinged to the body left-and-right movement lower guide shaft and the body left-and-right movement upper guide shaft, the left-and-right movement driving mechanism is arranged on the body framework and is connected with the body left-and-right movement lower guide shaft and the body left-and-right movement upper guide shaft, and the upper polishing mechanism and the lower polishing mechanism are respectively arranged on the upper frame and the lower frame. The body movement mechanism is simple and compact in structure, small in size, convenient to operate and capable of performing accurate control, the working efficiency is improved, and the defective product production rate is reduced.