The invention discloses a line parameter correction method based on parameter sensitivity, which is used for the correction of line parameters of a power system. The power system comprises a generator, a load, a transformer and a line. The method comprises the following steps: obtaining the original parameters of the power system and marking the suspicious lines through calculation; Judging the measured data on the suspicious line and marking it as the line to be corrected if there is no data error; calculating the correction amount and correcting the line to be corrected. The method comparesthe calculation result of the system power flow with the measured value, can accurately and quickly find out the line needing to revise the system parameters, and has universal applicability.