Due to the characteristics of electrolytic capacitors and other components, the impact and collision in the actual production logistics and packaging and packing process can easily lead to pin bending, which will affect the packaging and use of products. Therefore, an automatic capacitor pin straightening mechanism is designed to replace manual straightening to improve the production quality and efficiency. This paper puts forward a new kind of pin comb tooth straightening method. According to the comb tooth straightening institutions operating characteristics and elastic-plastic straightening theory, the influence factors of the neutral layer curvature radius and springback angle after pin straightening are obtained, and the key components of the straightening mechanism are designed through the simulation results of its parameters. A complete design scheme of electrolytic capacitor pin straightening mechanism is finally obtained. According to the elastoplastic theoretical analysis and simulation results, the most suitable straightening parameters of comb tooth are 1 mm clearance, 6 mm thickness and 0.1 friction coefficient. The straightening qualified rate and straightening efficiency of the capacitor pin straightening mechanism meet the actual processing and production requirements.