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There are many factors that affect the accuracy of thermocouple temperature measurement in the industrial field. In addition to the error of the thermocouple itself, it is mainly the input channel error, the cold junction compensation error, and the non-linear correction error of the reference table. Focusing on three main factors, era high-precision thermocouple temperature measurement circuit that can be applied in a complex industrial environment is designed. The error calculation formula is given based on the in-depth analysis of the internal mechanism of the errors for the first two factors in combination with the design scheme. An equal-precision least-square fitting correction algorithm is proposed for nonlinear correction errors. Using this algorithm, the temperature measurement range can be automatically divided into equal-precision intervals according to the correction accuracy requirements. Compared with the traditional interpolation method, without increasing the amount of calculation greatly improve the correction accuracy. The proposed error calculation formula and nonlinear correction method have applicability and important guidance for the design of high-precision thermocouple temperature measurement circuit. It has been verified by practical application that the design method can meet the requirement of high precision temperature measurement in complex industrial environment