A data sending feedback method, comprising: when reception of a radio frame fails, detecting, by a receiving station, whether transmission of the radio frame over a specified sub-channel in a working channel ends within predetermined time; and after the receiving station detects that the transmission of the radio frame over the specified sub-channel in the working channel ends within the predetermined time, sending, by the receiving station, a feedback frame to a sending station of the radio frame; characterized in that: the receiving station considers that the reception of the radio frame fails under one of the conditions that: the receiving station successfully decodes a physical preamble part corresponding to the radio frame over any one sub-channel in the working channel, and unsuccessfully decodes the physical preamble part over any one sub-channel; the receiving station successfully decodes the physical preamble part corresponding to the radio frame over any sub-channel in the working channel, and a bandwidth sum of all sub-channels over which decoding is performed successfully is inconsistent with a bandwidth obtained by decoding; and the receiving station successfully decodes the physical preamble part corresponding to the radio frame over any one sub-channel in the working channel, and unsuccessfully decodes a data part; and the radio frame comprises the physical preamble part and the data part, the physical preamble part is sent over one or more sub-channels of the radio frame, and the data part is sent over the entire working channel. when reception of a radio frame fails, detecting, by a receiving station, whether transmission of the radio frame over a specified sub-channel in a working channel ends within predetermined time; and after the receiving station detects that the transmission of the radio frame over the specified sub-channel in the working channel ends within the predetermined time, sending, by the receiving station, a feedback frame to a sending station of the radio frame; characterized in that: the receiving station considers that the reception of the radio frame fails under one of the conditions that: the receiving station successfully decodes a physical preamble part corresponding to the radio frame over any one sub-channel in the working channel, and unsuccessfully decodes the physical preamble part over any one sub-channel; the receiving station successfully decodes the physical preamble part corresponding to the radio frame over any sub-channel in the working channel, and a bandwidth sum of all sub-channels over which decoding is performed successfully is inconsistent with a bandwidth obtained by decoding; and the receiving station successfully decodes the physical preamble part corresponding to the radio frame over any one sub-channel in the working channel, and unsuccessfully decodes a data part; and the radio frame comprises the physical preamble part and the data part, the physical preamble part is sent over one or more sub-channels of the radio frame, and the data part is sent over the entire working channel. the receiving station considers that the reception of the radio frame fails under one of the conditions that: the receiving station successfully decodes a physical preamble part corresponding to the radio frame over any one sub-channel in the working channel, and unsuccessfully decodes the physical preamble part over any one sub-channel; the receiving station successfully decodes the physical preamble part corresponding to the radio frame over any sub-channel in the working channel, and a bandwidth sum of all sub-channels over which decoding is performed successfully is inconsistent with a bandwidth obtained by decoding; and the receiving station successfully decodes the physical preamble part corresponding to the radio frame over any one sub-channel in the working channel, and unsuccessfully decodes a data part; and the radio frame comprises the physical preamble part and the data part, the physical preamble part is sent over one or more sub-channels of the radio frame, and the data part is sent over the entire working channel.