The invention discloses a remote sensing image radiation correction method which includes the steps of measuring a solar zenith angle theta, a topographic slope angle alpha, a solar azimuth, a topographic slope azimuth and earth surface radiance L (lambada) of an imaging area when a remote sensing image is imaged, calculating a topographical correction factor Tscs+c, calculating direct radiation, scattered radiation of a horizontal plane pixel and an atmospheric projection asymmetry index k (lambada, z) through a MODTRAN model, calculating earth surface incidence solar radiation E (lambada, z), extracting atmospheric top layer radiation L1 (lambada) from the remote sensing image, working out path radiation Lp (lambada, z) of the imaging area and transmittance Tu (lambada, z) from the earth surface to a pupil-inlet position of a sensor through the MODTRAN model, and obtaining earth surface reflectance rho (lambada), wherein the lambada is a spectral wavelength received by a remote sensor and the z is an elevation monitored by the remote sensor.