The invention discloses a fidelity enhanced beamforming method based on a distorted towed array, comprising the following steps: (1) simulating the radiation noise s(t) of an underwater acoustic target; (2) simulating the observation array signal xi(t), i =1,2,...,M, M is the number of elements in the towed array; (3) Roughly estimate the target orientation based on ideal beamforming as the steering angle when the target signal beam energy is maximum; (4) Detect the L of the target signal The line spectrum position l=1,2,...,L with the largest power; (5) Estimate the average delay difference △τi of each array element in the towed array from the phase difference at the strong line spectrum position, i=1 ,2,...,M; (6) Obtain fidelity-enhanced target tracking beam based on estimated time delay This method uses time delay estimation to correct the influence of distortion of the towed line array on beamforming, and obtain fidelity-enhanced target radiation Noise tracking beam.