The invention provides an all-optical-fiber current transformer system with a temperature measurement function. The all-optical-fiber current transformer system comprises a current sensing optical path and a temperature sensing optical path, the current sensing optical path comprises a laser device, an optical fiber coupler, an optical fiber circulator, an optical fiber polarizer, a phase modulator, an optical fiber delay ring, a current transformer sensing ring and a first photoelectric detector in sequence connection, and the first photoelectric detector is connected with an end D3 of the optical fiber circulator. The temperature sensing optical path comprises a laser device, an optical fiber coupler, an optical fiber temperature sensor and an optical comb shaped filter in sequence connection, and the optical comb shaped filter is connected with an end C of the optical fiber coupler. The all-optical-fiber current transformer system has the advantages that the temperature sensing optical path is added, current and temperature measurement functions are integrated, temperature compensation can be performed for the current transformer sensing ring, a corrected current value serves as a judgment basis of relay protection, the optical fiber temperature sensor and the current transformer sensing ring can jointly participate in relay protection, and accordingly accuracy of relay protection judgment is improved.