Correction method for improving high-temperature strain measurement precision

The invention discloses a correction method for improving high-temperature strain measurement precision. The correction method comprises the following steps: carrying out calibration experiments on sensitivity coefficient, heat output, null drift and creep parameters of a high-temperature strain sensor; aiming at the sensitivity coefficient and the heat output, fitting calibration results at different temperatures to obtain a curve expression of the sensitivity coefficient and a curve expression of the heat output at different temperatures; aiming at the null drift and the creep, respectively selecting calibration results of a preset duration as calibration data at corresponding temperatures, and then respectively fitting the calibration results at different temperatures to obtain a curve expression of the null drift and a curve expression of the creep at different temperatures; based on this, establishing a comprehensive correction model; and correcting the measurement result of the high-temperature strain m