The invention relates to a fast channel switching method for use in a power wireless communication system. The method comprises the following steps that: a base station configures one or more standbychannels for terminal equipment; if downlink transmission fails due to strong interference, the terminal equipment feeds back a retransmission instruction and a standby channel switching instruction to the base station, wherein the standby channel switching instruction includes a preferred standby channel index; the base station performs data retransmission with a preferred and available standby channel after receiving the retransmission instruction and the standby channel switching instruction; and the terminal equipment monitors downlink data on the preferred standby channel until retransmitted data are received. Through adoption of the method, fast channel switching can be realized in the case of sudden strong interference, thereby avoiding interference frequency points in time and completing data transmission as soon as possible.