The invention provides a preparation method of a special side-slope artificial-soil fertilizer containing an organic molybdenum element, wherein the fertilizer is prepared by processing raw material components comprising ammonium molybdate , a complexing agent, a catalytic promoter, a mixture containing turf or / and chicken manure or / and cattle manure, bentonite, zeolite powder, attapulgite powderand a chemical fertilizer under a certain condition. The invention has remarkable effects in the aspects of enhancing the effectiveness of the molybdenum element of side-slope artificial soil, preventing and curing the physiological diseases caused by the molybdenum deficiency of plants, improving the physical and chemical characteristics of the side-slope artificial soil and promoting the growthand the development of the plants.