Compared with traditional direct charging method，the wireless charging has the advantages of low wear，good safety，intelligence and so on.This paper compares the advantages and disadvantages of such three wireless charging methods as electromagnetic induction，microwave transmission and electromagnetic resonance，believes that electromagnetic resonance method is more suitable for the charging of mobile robots，gives an overall design scheme based on this method，then conducts circuit modeling and mathematical analysis for the coupled system in this scheme，and then uses professional circuit simulation software to make simulation and test on the scheme.The results are basically consistent with theoretical analysis.Finally，this paper points out the problems in this wireless charging method and its future development direction.