The invention discloses a bidirectional time delay detection method and apparatus. The method comprises the steps of: framing acquired signals; calculating a sum of squared differences of first signal feature parameters of a preset number of frames of a first signal from a first preset signal frame and second signal feature parameters of a preset number of frames of a second signal from a second preset signal frame, wherein the first preset signal frame is a signal frame of the first signal at a preset moment, and the second preset signal frame is an mth signal frame after a signal frame of the second signal, which corresponds to the preset moment; sequentially circulating the operation of calculating the sum of squared differences of the first signal feature parameters and the second signal feature parameters from a next frame of the first preset signal frame, wherein the number of circulating times is at least a sum of the maximum positive time delay frame number and the maximum negative time delay frame number; acquiring a minimum value of the sums of the squared differences and a sequence number of a start frame corresponding to the minimum value; and according to the sequence number of the start frame, calculating a time delay value. A time delay phenomenon can be detected in real time in the using process of equipment; and meanwhile, not only can detection of positive time delay be implemented, but also detection of negative time delay can be implemented.