Abstract: To improve the utilization rate of available space, the traditional non-adjustable connection structure is replaced by the folding mechanism which can be changed according to the set trajectory, and a calculation and design method for the collapsible connecting rod mechanism is proposed. The length, angle and diameter of each connecting rod are obtained through the UG modeling and assembly simulation, and the dimensional parameters between each component are finally determined through CAD 2D structure optimization design, so as to solve the interference problems existing in the folding process, and meet the requirements of actual working conditions. The folding design effectively solves the problems of low space utilization and incomplete connecting rod function, and provides a good reference value for the actual connecting rod installation design.