The invention relates to a method for producing an organic fertilizer with humic properties by oxidizing and ammonifying lignite, wherein the organic fertilizer has a nitrogen content of up to 8 wt.% based on the dry weight of the fertilizer and a C/N ratio ranging from 7 to 15. The invention is characterized in that the method is carried out as a continuous method and has the following steps: a) dispersing the lignite and aqueous ammonia solution in a dispersing circuit using a dispersing device, a recirculation container, and a recirculating pump; b) oxidizing the suspension from step a) with an oxygen-containing oxidizing agent at a temperature of <100 °C in an oxidation reactor; c) drying the product suspension obtained in step b) at a temperature of >50 °C; and d) cooling the dried product obtained in step c).
