The invention relates to a method for measuring the biochar content in soil, and relates to the technical field of measurement of biochar contents. The method comprises the steps of: acquiring a soilsample not containing biochar and a soil sample containing biochar, performing air drying, grinding, and sieving through a 2mm sieve, for use; weighing 10.00g of the soil sample containing biochar after being dried at 105 DEG C, as the TZ value, putting the soil sample containing biochar into a crucible, putting in a muffle furnace to burn for 4h at 550-600 DEG C, cooling, weighing, and calculating the incineration volatilization ZHF of the soil sample; processing 10.0g of the soil sample not containing biochar by repeating the above steps, and calculating the loss ratio THEB of combustion volatilization of the soil sample not containing biochar; and, repeating the above steps, incinerating 5.00 g of biochar, weighing after cooling, calculating the ratio CHFB of incineration volatilizationof the pure biochar, and putting the value into the formula: TC=(ZHF-THFB*TZ)/(CHFB-THFB), so that the biochar content TC in the soil is obtained. The method in the invention has the benefits of being high in measurement accuracy, rapid, simple, convenient, unnecessary to add a chemical reagent, free from environmental pollution, capable of realizing batch measurement, and low in measurement cost.