Dynamic deviation correction method for liquid chromatogram infusion pump

The invention provides a dynamic deviation correction method for a liquid chromatograph infusion pump. The liquid chromatograph infusion pump comprises a position detection mechanism used for detecting the fixed position of a cam. Firstly, the differential pulse number from a fixed position to a starting point position of a cam is measured according to cam action characteristics; according to the stepping angle and the transmission ratio of the stepping motor, calculating a cam rotation theoretical pulse number in each correction period; the pulse deviation direction and deviation value of the current period are calculated according to the accumulated number of pulses reaching the fixed position in each period; judging whether single deviation overrun or accumulated deviation overrun is triggered or not, and if not, correcting the pulse count value; the pulse count value correction comprises the step of correcting the recorded count value when the fixed position is reached into the theoretical pulse number of