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The Fiber Bragg Grating sensor has the advantages of electrical isolation, anti-interference, and small load, which is extremely suitable for sensing measurement in engineering fields. At present, FBG sensors have been widely used in China's civil field, but research in aerospace field has just begun. In theory, FBG sensors can be used in the aerospace field, but due to the complex and special space environment different from the ground in space: low temperature, vacuum, radiation, etc., the negative impact of these factors on sensing must be considered in the application. In this paper, we use the electroless mental plating technology to fabricate a metal-coated sensitized fiber Bragg grating temperature sensor, and study its temperature sensitivity and accuracy under low temperature environment, the temperature sensitivity in low temperature environment is above 6pm/°C, and the repetition accuracy is about±1.7°C. which can provide reference for the aerospace research of FBG sensors technology.