A method for recovering audio signals, comprising: buffering an audio signal which is sampled at a preset number of sampling points; performing fast Fourier transform, FFT, on the sampled audio signal to obtain an FFT result; according to the FFT result, if a first frequency point satisfying preset conditions is present, converting the audio signal sampled at the preset number of sampling points into audio signals of a plurality of frequency subbands having an equal width, and determining a target frequency subband to which the first frequency point belongs, wherein the preset conditions are that a difference between a frequency of the first frequency point and a frequency of a second frequency point is less than a first preset value, a difference between powers of the first frequency point and the second frequency point is greater than a second preset value, a power of a frequency point having a frequency greater than the frequency of the first frequency point is zero, and the frequency of the second frequency point is less than the frequency of the first frequency point; recovering, according to the audio signal of a previous frequency subband of the target frequency subband, the audio signal of the target frequency subband and the audio signals of the frequency subbands after the target frequency subband in the plurality of frequency subbands; synthesizing the audio signals of the frequency subbands before the target frequency subband in the plurality of frequency subbands, the audio signal of the target frequency subband, and the audio signals of the frequency subbands after the target frequency subband in the plurality of frequency subbands to obtain a synthesized audio signal; separating the synthesized audio signal according to the first frequency point to obtain high-frequency signals and low-frequency signals, determining non-normalized coefficients of an all-pass biquad infinite impulse response, IIR, filtering algorithm according to the frequency of the first frequency point and the sampling rate, and inputting the high-frequency signals into the all-pass biquad IIR filtering algorithm to perform nonlinear phase offset on the high-frequency signals to obtain high-frequency signals subjected to phase recovery, wherein a frequency response curve and gain of the all-pass biquad IIR filtering are determined according to the non-normalized coefficients; and superimposing the high-frequency signals subjected to phase recovery and the low-frequency signals to obtain a sampled audio signal in which the high-frequency signals are recovered. buffering an audio signal which is sampled at a preset number of sampling points; performing fast Fourier transform, FFT, on the sampled audio signal to obtain an FFT result; according to the FFT result, if a first frequency point satisfying preset conditions is present, converting the audio signal sampled at the preset number of sampling points into audio signals of a plurality of frequency subbands having an equal width, and determining a target frequency subband to which the first frequency point belongs, wherein the preset conditions are that a difference between a frequency of the first frequency point and a frequency of a second frequency point is less than a first preset value, a difference between powers of the first frequency point and the second frequency point is greater than a second preset value, a power of a frequency point having a frequency greater than the frequency of the first frequency point is zero, and the frequency of the second frequency point is less than the frequency of the first frequency point; recovering, according to the audio signal of a previous frequency subband of the target frequency subband, the audio signal of the target frequency subband and the audio signals of the frequency subbands after the target frequency subband in the plurality of frequency subbands; synthesizing the audio signals of the frequency subbands before the target frequency subband in the plurality of frequency subbands, the audio signal of the target frequency subband, and the audio signals of the frequency subbands after the target frequency subband in the plurality of frequency subbands to obtain a synthesized audio signal; separating the synthesized audio signal according to the first frequency point to obtain high-frequency signals and low-frequency signals, determining non-normalized coefficients of an all-pass biquad infinite impulse response, IIR, filtering algorithm according to the frequency of the first frequency point and the sampling rate, and inputting the high-frequency signals into the all-pass biquad IIR filtering algorithm to perform nonlinear phase offset on the high-frequency signals to obtain high-frequency signals subjected to phase recovery, wherein a frequency response curve and gain of the all-pass biquad IIR filtering are determined according to the non-normalized coefficients; and superimposing the high-frequency signals subjected to phase recovery and the low-frequency signals to obtain a sampled audio signal in which the high-frequency signals are recovered.