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Thermocouple is widely used in the temperature measurement of spacecraft thermal vacuum test. At present, there is no quick and effective method for verifying the thermocouple implementation during the assembly stage. The method which relying on using human hand to touch the measuring point and observing the thermocouple resistance change has some limitations. In order to improve the accuracy and effectiveness of thermocouple detection, a portable thermocouple detection system was designed to detect short circuit, open circuit and the correctness of paste position of thermocouple. The temperature acquisition module based on MAX 31855 can quickly acquire and display thermocouple temperature. The outlet temperature control and heating temperature limits of the heating module ensure the safety of spacecraft during the detecting process. The test shows that the detecting system has the ability to detect the thermocouple on the surface of the spacecraft with flexibility, high test efficiency and high practicability.