Abstract: In recent years, China’s electronic product market has maintained rapid growth. Its power consumption problem and battery life have also become one of the bottlenecks restricting the development of electronic products. Aiming at this problem, this paper designs an intelligent charging system, which consists of single-chip microcomputer, relay, power supply, sampling, display, button and other modules. The single-chip microcomputer collects voltage and current values to display the charging voltage and current on the LCD, displays the battery power percentage by coulomb counting method, and controls the charging time period by controlling relays to achieve peak-valley optimized charging and overcharge protection. Practical application shows that the design has high promotion value in energy saving and emission reduction.