In order to obtain accurate aerodynamic data from unsteady wind tunnel test, it is necessary to correct the wall interference, so the study on wind tunnel wall interference correction of airfoil low-speed dynamic pressure measurement was carried out in NF-3 wind tunnel of Northwestern Polytechnical University. Using a group of NACA0012 airfoil models with same geometric similarities and different sizes, dynamic pressure measurement were carried out under the conditions of Reynolds number of 1.5x10^6 , mean attack angle of 10°,amplitude of 10° and reduced frequency K=2πf/V=0.03、0.05、0.07.Different scale model test results are interpolated to 0 scale under the same dimensionless dynamic parameters to calculate the wall interference. The wind tunnel test results are used to evaluate and correct the wall interference of dynamic test, which verifies the feasibility of the correction method. This method can provide references and ideas for wall interference correction.