The invention provides a detection method of a metal powder laser rapidly-molded temperature field, belonging to the technical field of temperature field detection. The detection method comprises the following steps: pre-arranging a plurality of through holes and blind holes for containing high-temperature thermoelectric couples at different positions of a molded base plate simultaneously detecting temperature and comparing according to the through holes and the blind holes, so as to obtain a specific principle of a difference between the temperature fields in a molded work piece and the base plate in a laser rapidly-molding process and obtaining the temperature field in the molded work piece through a blind hole temperature measuring method. A temperature detection system is not easy to influence by an external machining process so that the measurement precision is ensured. A more accurate temperature field distribution is obtained through optimally arranging temperature measuring points. The advantages of direct temperature measurement and indirect temperature measurement are integrated and the thermoelectric couples in the blind holes are not directly contacted with the molded work piece and can be repeatedly used, so that the cost is saved. Through a plurality of times of experiments, a difference rule of the temperature fields in the molded work piece and the base plate is obtained and the quantity of the thermoelectric couples in the through holes is gradually reduced and the cost is reduced. The stability of temperature measurement software is higher, the expandability is good and the function is strong.