This article proposes a high-precision batch temperature measurement system and testing method for low temperature measurement efficiency of high-precision temperature sensors, the system with the ability testing multiple cores. This article proposes classification method, binary scanning method, and successive approximation method to calibrate the platinum resistance PT100 for the low testing accuracy of platinum resistance PT100. After calibration, the maximum temperature measurement error value in the temperature range of -65 ℃ to 145 ℃ is changed from 0. 412 ℃ to 0. 021 ℃ , and the temperature measurement accuracy is improved by 94. 9%. Simultaneously, the stability, temperature measurement time, and temperature measurement accuracy of the system are modeled and simulated. Firstly, Heat transfer modeling is conducted for the outer wall to the inner wall and convective heat transfer of cold fluid in internal cavity of the thermostatic device respectively. The simulation result shows that the thermostatic device can achieve heat balance in only 75. 2 seconds. Then, the tested circuit heating up, the base heating up, and the calibrated platinum resistance is modeled by comprehensive thermal simulation. The simulation result shows that the temperature measurement accuracy of the system can reach to 0. 016 ℃ . Finally, the external and internal temperatures of several classic high-precision temperature sensors are tested and verified, and the result shows that the system can test temperature sensors with a temperature measurement accuracy of 0. 031 ℃ , which can well meet the temperature measurement requirements.