The invention discloses a fixing method of optical fibers in a wiring process in a transformer. The fixing method comprises the following steps that A, the optical fibers penetrate gaps between transformer windings to make a plurality of optical fiber curve portions, and temporary fixing is conducted on the two ends of each optical fiber curve portion by insulating tape; B, the surface tensile force of each optical fiber decreases gradually from the end in the transformer to the end outside the transformer; C, when an area appears where two optical fibers are parallel to each other and the distance between the two optical fibers is smaller than a threshold valve, the surface tensile force of the two optical fibers keep linearly correlated; D, when two optical fibers intersect, the opticalfiber below penetrates an arbitrary optical fiber curve portion of the optical fiber under; E, when the optical fiber completely penetrates in place, secondary adjustment is conducted on the surface tensile force of the optical fibers; F, sticking fixing is conducted on the optical fibers. By means of the method, the deficiencies of the prior art are improved, and the working stability of the optical fibers in the transformer is improved.