A circuit for avoiding channel interference, comprising a wireless local area network Wi-Fi chip, wherein the circuit further comprises: at least one first single-pole multi-throw switch, wherein a movable end of the first single-pole multi-throw switch is connected to a signal transmit pin of the Wi-Fi chip; and the first single-pole multi-throw switch comprises at least two non-movable ends, a first non-movable end of the at least two non-movable ends is connected to a first signal transmit tributary that exists between the first single-pole multi-throw switch and an antenna, and a second non-movable end of the at least two non-movable ends is connected to a second signal transmit tributary that exists between the first single-pole multi-throw switch and the antenna; the second signal transmit tributary comprises a power attenuator, and an input end of the power attenuator is connected to the second non-movable end of the first single-pole multi-throw switch; and when the Wi-Fi chip determines that a first channel and a second channel interfere with each other, the movable end of the first single-pole multi-throw switch is controlled to connect to the second non-movable end of the first single-pole multi-throw switch, wherein the first channel is a wireless local area network channel, and the second channel is different from the wireless local area network channel; wherein the circuit further comprises: a second single-pole multi-throw switch, and a band-pass filter and the radio-frequency signal transceiver antenna that are sequentially connected in series to a movable end of the second single-pole multi-throw switch, wherein a first non-movable end of the second single-pole multi-throw switch is connected to the first non-movable end of the first single-pole multi-throw switch; an output end of the power attenuator is connected to the first non-movable end of the second single-pole multi-throw switch; and a second non-movable end of the second single-pole multi-throw switch is connected to a signal receive pin of the Wi-Fi chip by using the band-pass filter, wherein the second single-pole multi-throw switch connects, under control of a connection control signal transmitted by the Wi-Fi chip, the movable end of the second single-pole multi-throw switch and the first non-movable end of the second single-pole multi-throw switch, or the movable end of the second single-pole multi-throw switch and the second non-movable end of the second single-pole multi-throw switch. at least one first single-pole multi-throw switch, wherein a movable end of the first single-pole multi-throw switch is connected to a signal transmit pin of the Wi-Fi chip; and the first single-pole multi-throw switch comprises at least two non-movable ends, a first non-movable end of the at least two non-movable ends is connected to a first signal transmit tributary that exists between the first single-pole multi-throw switch and an antenna, and a second non-movable end of the at least two non-movable ends is connected to a second signal transmit tributary that exists between the first single-pole multi-throw switch and the antenna; the second signal transmit tributary comprises a power attenuator, and an input end of the power attenuator is connected to the second non-movable end of the first single-pole multi-throw switch; and when the Wi-Fi chip determines that a first channel and a second channel interfere with each other, the movable end of the first single-pole multi-throw switch is controlled to connect to the second non-movable end of the first single-pole multi-throw switch, wherein the first channel is a wireless local area network channel, and the second channel is different from the wireless local area network channel; wherein the circuit further comprises: a second single-pole multi-throw switch, and a band-pass filter and the radio-frequency signal transceiver antenna that are sequentially connected in series to a movable end of the second single-pole multi-throw switch, wherein a first non-movable end of the second single-pole multi-throw switch is connected to the first non-movable end of the first single-pole multi-throw switch; an output end of the power attenuator is connected to the first non-movable end of the second single-pole multi-throw switch; and a second non-movable end of the second single-pole multi-throw switch is connected to a signal receive pin of the Wi-Fi chip by using the band-pass filter, wherein the second single-pole multi-throw switch connects, under control of a connection control signal transmitted by the Wi-Fi chip, the movable end of the second single-pole multi-throw switch and the first non-movable end of the second single-pole multi-throw switch, or the movable end of the second single-pole multi-throw switch and the second non-movable end of the second single-pole multi-throw switch.