Compared with fixed wings, retractable wings can effectively reduce the waste of aircraft missile bay. The reliability reduction will become a problem that cannot be ignored due to the existence of the kinematic mechanism of the telescopic wing. In order to explore the reliability of the new mechanism, this paper calculates the positioning reliability of a certain type of telescopic wing deployment mechanism from a theoretical perspective, uses Adams to simulate the deployment process of the telescopic wing, combines the Adams/Insight module to calculate the clamping reliability under the friction force, analyzes the reasons for the clamping failure of the telescopic wing. The results show that the presence of foreign matter will significantly reduce the positioning reliability of the telescopic wing, and the main reason for the reduced jamming reliability is the additional torque generated by the upper and lower wing springs at the center of mass of the upper wing.