With the gradual upgrading of industrial production to intelligence and precision, industrial products have become more intelligent and more precise, which has higher requirements for assembly, in order to achieve precision assembly, some precise and compact functional units are more and more widely used. The compensation unit XY can realize the floating of the device structure in the X-Y direction and the small Angle floating at the same time. Its performance characteristics are as follows: 1. The main structure is made of magnesium aluminum alloy material, which has the characteristics of high strength and light weight; 2. Sliding guide design, more compact structure, can work under higher torque; 3. Built-in center locking cylinder to ensure that the origin position of the mechanism is unchanged; 4. Built-in position memory cylinder, some occasions can maintain the current offset position; 5. Imported sealing ring to ensure stable and reliable sealing;