The invention discloses an electronic device which comprises an analog signal port, an analog signal interface module connected with the analog signal port, a serial data interface module and a microprocessor, wherein the analog signal interface module and the analog signal port are connected through a first signal line and a second signal line; the serial data interface module comprises a data transmitting unit, a data receiving unit and a control register, the data transmitting unit, the data receiving unit and the control register of the serial data interface module are in communication connection with the microprocessor via data buses, and the transmitting end of the data transmitting unit and the receiving end of the data receiving unit are respectively connected with the first signal line and the second signal line; and the microprocessor opens or closes the serial data interface module by setting the control register. The invention also discloses an analog signal port multiplexing method of the electronic device. The electronic device has more beautiful appearance, the design and manufacturing cost is saved, and the electronic device is more convenient for debugging, maintenance or upgrading.