An on-line thermocouple auto-calibration system using wireless communication module for ceramic kilns has been developed. It is consist of the temperature measurement module for the ceramic kilns, Wireless transmitting and receiving module, data processing and results display module of the PC. For the requirement of thermocouple calibration for ceramic kilns, the wireless data transmission module is used to transmit temperature data in the system. Finally, the data is transmitted to PC through serial interface, it is processed and the calibration results are derived by PC. Its performance fully met calibration requirements. The calibration efficiency of the system is greatly enhanced and the additional man-made errors are reduced. The proposed system ran well in practice.