The invention discloses an intelligent diagnosis system for an optical fiber link. The intelligent diagnosis system for an optical fiber link includes an encoding unit, the coding unit is formed by implanting an optical fiber code into the optical fiber grating; a plurality of coding units form a fiber grating group; Different coding units are combined to obtain a unique identification feature composed of optical fiber codes; the detection module reads the address code; the address code is transmitted to the monitoring station; the monitoring station processes the address code; analyzing to obtain the operation state of the optical fiber link; The optical fiber codes of the optical fiber link can be read remotely according to the optical fiber codes in the optical fiber grating, accurate identification of the optical fiber station is achieved, then identification management of the optical fiber link is achieved, automatic diagnosis and accurate positioning are conducted on faults of the optical fiber link, and operation and maintenance personnel can conveniently, accurately and rapidly remove the faults.