The use of wireless power supply instead of the traditional slide line power supply for DC servo motor can greatly improve the reliability of the system and reduce the maintenance cost. However, the DC servo motor is often in the start and stop working state, which will cause the wireless power supply bus voltage to rapidly decrease or rise, and even affect the normal operation of the DC servo motor. Therefore, it is of great significance to design a moving DC servo motor wireless power supply system with excellent anti-impact load performance. The system adopts the LCL/S compensation topology, the magnetic coupling mechanism adopts the long-track transmitting and E-type receiving structure, and the digital closed-loop Buck converter is connected in the rear stage to achieve accurate and constant voltage output. Then the output characteristics are analyzed. To verify the theoretical analysis, a prototype of DC servo motor wireless power supply system was built, and a DC servo motor was successfully powered stably. The results show that when the DC servo motor drives the trolley with 11.95kg weight, the energy transfer efficiency can reach 86.89%, and the system can always guarantee the constant voltage.