With the rapid development of portable electronic products, electronic products also more and more consumers carry. In order to solve the problem of quick charge for a variety of portable electronic products, application of STM32 MCU design an intelligent multichannel Lilon battery charger .This design integrates four road charging loop, each loop control independently, without mutual influence. It is through the analog switch to respectively gating charge circuit, and use the button to select the initialization of charging parameters, using PWM wave to regulate the charging process. The experimental results show that under the premise of guarantee the charging time, this design can effectively realize multichannel charging at the same time, and through the button to choose, can choose for two kinds of the size of 3.7 V and 7.4 V lithium battery.