NOVELTY - Invention relates to the fields of ecology and natural restoration, in particular to methods for producing biochar - biochar from natural organic substrates for soil restoration from herbicides. The method for obtaining biochar from sewage sludge and sawdust is carried out as follows. Sewage sludge with a moisture content of 50-55% is mixed with sawdust with a moisture content of 8-10% in a ratio of 3:1. The mixture is heated to a temperature of 500-700°C at a rate of 15-20°C/min and carbonization is carried out without oxygen access for 3 hours. USE - Ecology and natural restoration. ADVANTAGE - Obtaining a final product with a rich mineral composition using a simplified technology, the use of which can reduce the herbicidal load on the soil. 1 cl, 4 ex, 2 tbl