Method for promoting gravel aggregate dewatered sludge to become soil by utilizing wood processing excess materials and biochar thereof

The invention provides a method for promoting gravel aggregate dewatered sludge to become soil by utilizing wood processing excess materials and biochar thereof, which comprises the following steps of: firstly preparing biochar, decomposed substance and wood vinegar fertilizer by utilizing wood processing excess materials, then treating gravel aggregate dewatered sludge into powdery sludge by utilizing the biochar together with zeolite and cationic polyacrylamide as auxiliary materials, mixing the powdery sludge and the decomposed substance, and applying a wood vinegar fertilizer to prepare excellent planting soil. The excellent planting soil prepared by the method is reasonable in structure, high in fertilizer efficiency and strong in water retention and drought tolerance, has a heavy metal content meeting national and industrial standards, is suitable for growth and development of most plants, solves the social problem that waste occupies land and pollutes the environment, relieves the awkward situation tha