The utility model provides a novel optical fiber grating temperature sensitization sensor, which comprises an optical fiber grating, a metal wire with a large thermal expansion coefficient and a substrate with a low thermal expansion coefficient. The temperature sensitization sensor is characterized in that one end of the metal wire with the large thermal expansion coefficient and one end of the substrate with the low thermal expansion coefficient are fixed together; at the other ends of the metal wire and the substrate, the substrate is slightly longer than the metal wire; and the two ends of the optical fiber grating are respectively provided with the metal wire and the substrate. The utility model has two main advantages: first, the utility model solves the problem that the high-resolution temperature sensor can not be stored and transported at the high temperature; secondly, the utility model reduces the influence of the metal inertia on the response speed of the sensor, and improves the response speed of the sensor.