A delay estimation method implemented by an audio coding device, wherein the method comprises: determining a cross-correlation coefficient of a multi-channel audio signal of a current frame; determining a delay track estimation value of the current frame based on buffered inter-channel time difference information of at least one past frame; determining an adaptive window function of the current frame; performing weighting on the cross-correlation coefficient based on the delay track estimation value of the current frame and the adaptive window function of the current frame, to obtain a weighted cross-correlation coefficient; and determining an inter-channel time difference of the current frame based on the weighted cross-correlation coefficient; wherein the method further comprises, before the determining an adaptive window function of the current frame: determining an adaptive parameter of the adaptive window function of the current frame based on a coding parameter of the previous frame of the current frame, wherein the coding parameter is used to indicate a type of a multi-channel audio signal of the previous frame of the current frame, or the coding parameter is used to indicate a type of a multi-channel audio signal of the previous frame of the current frame on which time-domain downmixing processing is performed; and the adaptive parameter is used to determine the adaptive window function of the current frame. determining a cross-correlation coefficient of a multi-channel audio signal of a current frame; determining a delay track estimation value of the current frame based on buffered inter-channel time difference information of at least one past frame; determining an adaptive window function of the current frame; performing weighting on the cross-correlation coefficient based on the delay track estimation value of the current frame and the adaptive window function of the current frame, to obtain a weighted cross-correlation coefficient; and determining an inter-channel time difference of the current frame based on the weighted cross-correlation coefficient; wherein the method further comprises, before the determining an adaptive window function of the current frame: determining an adaptive parameter of the adaptive window function of the current frame based on a coding parameter of the previous frame of the current frame, wherein the coding parameter is used to indicate a type of a multi-channel audio signal of the previous frame of the current frame, or the coding parameter is used to indicate a type of a multi-channel audio signal of the previous frame of the current frame on which time-domain downmixing processing is performed; and the adaptive parameter is used to determine the adaptive window function of the current frame. determining an adaptive parameter of the adaptive window function of the current frame based on a coding parameter of the previous frame of the current frame, wherein the coding parameter is used to indicate a type of a multi-channel audio signal of the previous frame of the current frame, or the coding parameter is used to indicate a type of a multi-channel audio signal of the previous frame of the current frame on which time-domain downmixing processing is performed; and the adaptive parameter is used to determine the adaptive window function of the current frame.