USB interface multiplexing circuit, USB interface multiplexing method and USB interface multiplexing apparatus

The invention discloses a USB interface multiplexing circuit. The USB interface multiplexing circuit comprises a main device module, a slave device module, a switch module and a USB interface, wherein a detection end of the main device module is connected to a detection signal end of the USB interface, a first control output end of the main device module is connected with a first control input end of the switch module, a data end of the main device module is connected with a first data end of the switch module, a data end of the slave device module is connected with a second data end of the switch module, and a third data end of the switch module is connected with a data end of the USB interface. The invention also discloses a USB interface multiplexing method and apparatus. The USB interface of the terminal is multiplexed simultaneously as a main device functional interface and a slave device functional interface, so that the main device function and the slave device function can be completed only by needing one USB interface on the terminal, and convenience is provided for the data transmission between the terminal and peripheral devices.