The invention discloses an atmospheric correction method during INSAR measurement. The method comprises the following steps of (1) using a WRF model to simulate a parameter needed during calculation of atmospheric delay, wherein the WRF model adopts GFS data as meteorological data; (2) calculating dry and wet atmospheric delay; (3) converting the atmospheric delay into phase delay; and (4) removing an atmospheric delay phase in an INSAR interference phase diagram. In the method, a mesoscale atmospheric model WRF is used to carry out atmospheric correction and the model can predict a weather condition and can reach a 1km resolution level, which is better than a prediction condition through using a method based on MERIS, MODIS and GPS data. By using the GFS meteorological data, a prediction data time interval is 3 hours and the data is updated for every 6b hours so that timeliness is high. A measurement result is accurate and the method is suitable for popularization and application.