Temperature scanning valves are core equipment for multi-channel thermocouple temperature measurement in the aerospace field, and their calibration accuracy directly affects the accuracy and reliability of test data. Aiming at the problems of traditional calibration methods such as low efficiency, high cost, requirement for equipment disassembly and susceptibility to damage, a fully automatic in-situ calibration system for temperature scanning valves has been developed, which is based on scanning switches, high-precision standards and host computer programs. Through a dedicated metrological measurement structure, in-situ calibration without equipment disassembly is realized, completing the on-site fully automatic in-situ verification and calibration of temperature scanning valves. Systematic comparative experiments have been carried out on four types of key parameters: measurement time, data acquisition interval, two-point calibration standard value combination, and channel switching stabilization time. Based on a comprehensive evaluation of error statistics and time consumption indicators, the optimal parameter configuration balancing accuracy and efficiency is determined as follows: measurement time 8 s, data acquisition interval 250 ms, calibration standard values (10 mV, 40 mV), and channel switching stabilization time 3750 ms. Under this configuration, the single-channel verification time of the system is 11.75 s, the 32-channel verification time is 12.6 minutes, and the total time including preheating is 72.6 minutes. The measurement repeatability (standard deviation) is 0.0033 mV, and the equivalent temperature error is 0.083 ℃. Comparative verification with similar devices shows that the calibration efficiency of the system is improved by 13 times, while in-situ calibration and fully automatic execution are achieved. It provides a reliable technical scheme and parameter configuration basis for the engineering application of in-situ rapid verification/calibration of temperature scanning valves, and metrological support for on-site in-situ calibration of multi-channel thermocouple temperature measurement.