UART communication signal conversion circuit multiplexed on charging signal line

The utility model discloses an UART communication signal conversion circuit multiplexed on a charging signal line. The UART communication signal conversion circuit comprises a triode T1, a resistor R1, a resistor R2, a resistor R3, a receiving end and a transmitting end, wherein the resistor R1, the resistor R2, the resistor R3 and the transmitting end are sequentially connected in series, the triode T1 and the resistor R2 are connected in parallel, the receiving end is connected with an emitter E of the triode T1, a collector C of the triode T1 is grounded, and the resistor R1 is further connected with a power supply. Through the structure, interference of a charging circuit to an UART communication signal is avoided, and UART signal isolation and level matching are realized by matching levels of an external UART signal and an internal chip.