The invention discloses an array signal denoising method for optical fiber ultrasonic array sensors, which belongs to the technical field of detection and aims at improving the sensitivity and the anti-interference ability of the array sensors. The method in the technical scheme comprises the following steps: a, EMD decomposition is carried out on signals acquired by each array element in the optical fiber ultrasonic array sensors; b, the decomposed signals are simplified; c, cross correlation operation is carried out on corresponding-order IMF components of signals of adjacent array elementsto calculate the time delay value; d, the comprehensive support degree of signals of each array element is calculated; e, the weight of the each-order IMF component is calculated; and f, the array sensor signals are reconstructed. On the basis of carrying out EMD decomposition on partial discharge ultrasonic array signals, partial discharge signals and noise signals are distinguished according toan array signal sealing vector time delay criterion, the array signal denoising problem is solved simply, the sensitivity and the anti-interference ability of the array sensors are greatly improved, and a new means is provided for ultrasonic array signal processing.