Abstract: Aiming at the detecting demand and problem of transient temperature of electrode tip in micro resistance spot welding of enamelled wire, the platform for micro resistance spot welding temperature measurement was established by using thermocouples. Taking the temperature measured result by fine wire thermocouple as the real temperature, a dynamic compensator based on ridge regression was constructed for common thermocouple temperature measured result to improve its dynamic response. And an indirect measurement method of welding temperature at electrode tip based on the correlation between temperature and resistance was proposed. Fine wire thermocouple and common thermocouple were selected to perform temperature measurement experiments under three closed-loop control modes respectively. Several features were extracted and compared from the temperature measurement data by common thermocouple, and dynamic compensator was established and verified. The relationship between the temperature of electrode tip and its resistance was analyzed, and the formula for calculating welding temperature of electrode tip was deduced. The results show that the selected characteristics are reasonable, and the detecting ability of common thermocouple for transient temperature of electrode tip can be improved by compensation. The welding temperature of electrode tip can be deduced from resistance information, and its variation characteristics are consistent with the physical process of spot welding.