According to the method, various plant mixtures are used as carriers, a sufficient amount of various wastewater containing urea is sprayed on (soaked in) the carriers, the mixtures are dried until themoisture content is 30%-50%, and the mixtures are smashed into powder with the thickness of 0-1-1.5 cm; drying the powder until the water content is 18-30%, and uniformly stirring the plant powder, pickling wastewater, kitchen waste wastewater, a plant soaking mixed solution, grain and oil food wastewater and urea according to a mass ratio of 1:3:3:3:3:0.02 by using a stirrer; drying the mixtureto a moisture content of 18%-30%; and inspecting the product, packaging the product in bulk, packing the product in 50 kg by bags, and storing and delivering the product. The product is semi-decomposed ecological organic compound (fertilizer) snow melting powder, is dark green in color, and can be pre-sowed, sowed after snow and re-sowed before and after snow by a manual machine. The product has anti-skid performance, and does not corrode the ground, facilities, greening vegetation, rubber tires, underground pipe networks and bridge construction workers. The product reduces the number of garbage, reduces sewage discharge, saves resources, protects the environment, and creates economic and social benefits.