A charging control circuit (100, 500), characterized by comprising a communications interface housing (102, 502, 300, 400), a communications interface (103, 503), and a control sub-circuit (101, 501), wherein the communications interface housing (102, 502, 300, 400) comprises a first conductive part (1021, 5021, 301), a second conductive part (1023, 5023, 302), and an insulating part (1022, 5022), and the insulating part (1022, 5022) is disposed between the first conductive part (1021, 5021, 301) and the second conductive part (1023, 5023, 302), and insulates the first conductive part (1021, 5021, 301) from the second conductive part (1023, 5023, 302); the first conductive part (1021, 5021, 301) is connected to a first voltage terminal, and the first voltage terminal is configured to access a first voltage; the second conductive part (1023, 5023, 302) is connected to a second voltage terminal, the second voltage terminal is configured to access a second voltage, and the first voltage is greater than the second voltage; and the control sub-circuit (101, 501) is connected to the first conductive part (1021, 5021, 301) and the communications interface (103, 503), and is configured to control, when it is detected that a voltage of the first conductive part (1021, 5021, 301) changes from the first voltage to the second voltage, starting of a power supply apparatus electrically connected to the communications interface (103, 503), so that the power supply apparatus provides a charging voltage to the communications interface (103, 503); wherein the voltage of the first conductive part (1021, 5021, 301) changes from the first voltage to the second voltage when the communications interface (103, 503) accesses a load which conducts the first conductive part (1021, 5021, 301) with the second conductive part (1023, 5023, 302). the communications interface housing (102, 502, 300, 400) comprises a first conductive part (1021, 5021, 301), a second conductive part (1023, 5023, 302), and an insulating part (1022, 5022), and the insulating part (1022, 5022) is disposed between the first conductive part (1021, 5021, 301) and the second conductive part (1023, 5023, 302), and insulates the first conductive part (1021, 5021, 301) from the second conductive part (1023, 5023, 302); the first conductive part (1021, 5021, 301) is connected to a first voltage terminal, and the first voltage terminal is configured to access a first voltage; the second conductive part (1023, 5023, 302) is connected to a second voltage terminal, the second voltage terminal is configured to access a second voltage, and the first voltage is greater than the second voltage; and the control sub-circuit (101, 501) is connected to the first conductive part (1021, 5021, 301) and the communications interface (103, 503), and is configured to control, when it is detected that a voltage of the first conductive part (1021, 5021, 301) changes from the first voltage to the second voltage, starting of a power supply apparatus electrically connected to the communications interface (103, 503), so that the power supply apparatus provides a charging voltage to the communications interface (103, 503); wherein the voltage of the first conductive part (1021, 5021, 301) changes from the first voltage to the second voltage when the communications interface (103, 503) accesses a load which conducts the first conductive part (1021, 5021, 301) with the second conductive part (1023, 5023, 302).