A hot-swapping method based on output voltage feedback is proposed for the challenge of fast replacement of artillery data processing modules under charged condition. The current research status of data processing module hot-swapping technology at home and abroad is described, and the feasibility of this hot-swapping technology is verified through modeling simulation and circuit design of practical application scenarios. The method has been successfully applied to the artillery data processing module. The application results show that the method can effectively improve the maintenance speed of the artillery control system.