Preparation method for harmless treatment and resource utilization of urban construction waste

The invention provides a preparation method for harmless treatment and resource utilization of urban construction waste, and relates to the technical field of urban construction waste treatment. The preparation method for harmless treatment and resource utilization of the urban construction waste comprises the following steps that S1, waste classification is conducted, specifically, gravel and sludge are separated through a gravel separator, and the gravel is crushed and ground; s2, sludge desulfurization: sulfate reducing bacteria are matched with ferrous carbonate and a sulfur ion analyzer for desulfurization; s3, nitrogen oxidation treatment: converting ammoniacal nitrogen into nitrate nitrogen by nitrite bacteria and nitrobacteria; s4, leaching and drying: the sewage is leached and dried by a drying stirrer in cooperation with thermophilic aerobic bacteria; and S5, feed treatment: mixing the dried sludge, rhodospirillum rubrum, lactobacillus casei, saccharomycetes, diatom, glucose, gelatin, corn steep liq