A device for testing recoil force on a plane is designed, which is used to analyze the force-exerting situation of the supporting parts of equipment a planar contact mounting. The core of the device is a piezoelectric sensor, by taking advantage of its high sensitivity and fast response characteristics, accurate capture of recoil force signals is achieved. A mathematical model of the recoil force is established through relevant mechanical principles to describe the quantitative relationships between the recoil force and various influencing factors. With the help of dynamic analysis, the dynamic behavior of the device during the testing process is deeply analyzed to clarify the force-bearing and motion states of each component, the influence of various parameters on the testing results is analyzed, and the structural design is optimized. Experimental verification is carried out. By comparing the experimental data with the theoretical analysis data, the rationality and accuracy of the device design are verified.