The invention discloses a method used for adjusting a transformer work load. The method comprises steps that, a relation model between the load coefficient and the environment temperature is established when a hot spot temperature of a transformer winding reaches 98 DEG C; the hot spot temperature of the transformer winding is detected in real time; the monitored real-time hot spot temperature is contrasted with 98 DEG C, based on the contrast result, the work load coefficient of the transformer is changed to be a load coefficient corresponding to the present environment temperature in the relation model. According to the method, the hot spot temperature can be measured by employing the fiber temperature measuring technology, direct measurement is carried out, and accuracy is high. Through the method, the hot spot temperature of the winding can be guaranteed to be close to 98 DEG C as much as possible when the transformer is in operation, the access work load is maximized, the economic benefits under the condition of safety operation is further maximized, and thereby a technical problem that safety and economic performance can not be simultaneously realized because of contradictory relations among the hot spot temperature, the environment temperature and the load coefficient is solved.