The invention belongs to the technical field of laser remote sensing and particularly relates to a laser altimeter atmospheric delay range finding error correction method for a land object. The invention first deduces the theoretical relationship between the atmospheric delay error and the surface atmospheric pressure, and thus simplifies the high pressure equation. According to the altitude and atmospheric pressure of the weather station measured by the ground meteorological station, the atmospheric pressure attenuation factor of each weather station is calculated, and the attenuation model of the atmospheric pressure with the height change is established. According to the latitude and longitude of the laser foot, nearest k weather stations are The results of cross validation show that the accuracy of the atmospheric pressure space-time interpolation of the method is higher than that of the NECP-based reanalysis data calculation method, and the method provided by the invention is of great value in the measurement accuracy improvement of the laser altimeter satellite.