The invention provides a reliability monitoring system for optical current transformer, which belongs to the technical field of optical current transformers. The invention is designed with the object of solving the problem that the reliability of an optical current transformer in the prior art cannot be verified. According to the invention, the light emitted by an LED light source is divided into two beams by an optical fiber splitter with one inputted to the entrance end of an optical current sensor and the other transmitted to a collector. The optical signal that passes the optical current transformer is connected to the collector; a primary optical fiber temperature sensor and a secondary optical fiber temperature sensor are both connected to a temperature modem through the optical fiber, and the temperature information obtained by the temperature modem is inputted to the collector through the optical fiber. The collector is connected with a merging unit. A reliable data recording unit analyzes the data information from the merging unit to obtain the working state information of the optical current transformer, the LED light source state information, and the temperature information measured by the primary optical fiber temperature sensor and the secondary optical fiber temperature sensor. All these data are recorded at fixed intervals. The invention is applied to an electric power system.