Abstract: The present disclosure relates to a method for thermal desorption treatment of organic-contaminated soil. The method includes: subjecting thermal desorption flue gas with a temperature of 120-700° C. and the organic-contaminated soil to a countercurrent contact reaction for 5-30 min to obtain desorption waste gas comprising an organic pollutant and thermally desorbed soil; drying biomass to a water content of ?12%, and crushing to a length of ?20 cm to obtain a biomass segment; uniformly mixing the thermally desorbed soil with the biomass segment to obtain a mixture A, carrying out low-temperature pyrolytic carbonization of the biomass in the mixture A at a temperature of 250-450° C., heating the soil to obtain remedied soil including organic carbon and pyrolysis gas from the low-temperature pyrolytic carbonization. The disclosure mixes the thermally desorbed soil with the biomass for pyrolytic carbonization, greatly improving the content of an organic matter, recovering a soil function.