In the manufacturing process of space column conductive slip ring，the molding quality of the ring body assembly affects the insulation performance and electrical transmission stability of the slip ring directly.In order to improve the sealing and insulation reliability of the ring body assembly of the laminated slip ring during the electroplating process，this paper proposes an anti-infiltration process based on semi-curing treatment of insulating spacers.This method includes coating epoxy film on the end surface of the spacer before assembly and performing，and forming a pre-closed structure through axial loading.A special coating tool was designed experimentally，and the film thickness control and bonding performance were systematically analyzed.The effectiveness of the technology was verified by cleaning efficiency，EDS spectrum analysis and component sectioning experiments.The results show that the process significantly improves the sealing performance of the component during the electroplating stage，the cleaning efficiency is increased by about 5 times，and the insulation value between the rings is stably increased to more than 1 500 MΩ. The research conclusion believes that the semi-curing process of insulating spacers has good process adaptability and promotion prospects， provides effective manufacturing process support for high-voltage and long-life space slip rings，and is an effective technical path to improve the manufacturing quality of high-reliability space slip rings.