The invention discloses an intelligent garment body temperature measuring model based on an optical fiber Bragg grating (OFBG), belonging to the technical field of intelligent garments. The invention establishes a mathematical model of an OFBG temperature field in the intelligent garments according to the heat transfer mechanism, determines the relation between the measured temperature and the actual temperature of the OFBG, and corrects the measured temperature value of the OFBG by utilizing the result to obtain the actual temperature of human skin. On the basis of multi-point weighted mean skin temperature, an intelligent garment body temperature weighting model formed by the skin temperature of the left chest, the right chest, the left armpit, the right armpit and the back is established. The body temperature weighting coefficients are as follows: the left front chest is 0.0826, the left armpit is 0.3706, the right armpit is 0.3706, the back is 0.0936, and the right front chest is 0.0826. The measuring error of the body temperature obtained by utilizing the weighting coefficients is +/-0.2DEG C, and the adjustment of the weighting coefficients under the special conditions of a damaged OFBG sensor and the like is considered.