The present invention relates to power intelligent transformer station process level communication network technology, and specifically relates to an intelligent transformer station process level optical fiber multi-wavelength isolated communication networking method. The method adopts wavelength division multiplexing with single fiber bi-directional transmission; a low loss window of the optical fiber is divided into three or more bi-directional transmission channels according to different frequencies or wavelengths of optical carrier signals of different channels; the GOOSE network, SMV network, and IEC61588 network of the process level are separately supported by carriers of different wavelengths via a process level major multi-wavelength switch, and are multiplexed and decomposed by a wavelength division multiplexer to form one physical network. The method enables the GOOSE network, SMV network, and IEC61588 network in the process level to share the same network and perform transmission in an isolated manner, thereby lowering the construction cost of the intelligent transformer station, and lowering the maintenance cost and construction difficulties.