Abstract: Traditional methods for detecting the insulation performance of conductive slip rings for spacecraft suffer from low accuracy and poor identification. A partial discharge testing method was employed to evaluate the insulation performance. The investigation examined the influence of insulation ring thickness, epoxy resin potting, and wire state on partial discharge in slip rings by adjusting the test voltage value and voltage application time. The results show that the partial discharge quantity increases significantly as the test voltage increases, and the critical voltage of partial discharge in unsealed slip rings is 1.0 kV. Potting protection reduces partial discharge, but internal voids can still lead to abnormal partial discharge. Epoxy resin potting adhesive with nano-fillers can effectively inhibit partial discharge. Increasing the insulation ring thickness may help improve the electrical performance, while wires that are bent or too long may exacerbate partial discharge. The research provides insights for the design, non-destructive testing, and reliability evaluation of conductive slip rings for spacecraft.