Preparation method and application of coal and oil co-refining catalyst

The invention relates to a preparation method and application of a coal and oil co-refining catalyst, and belongs to the technical field of material synthesis and application. The method comprises the following steps: adding urea into a ferric salt solution mixed with auxiliary metal ions, and stirring and reacting at 70-100 DEG C for 6-10 hours to obtain slurry; and filtering, and drying the filter residue at 20-100 DEG C to obtain the catalyst. The auxiliary metal ions are more than one selected from cobalt, nickel, molybdenum, copper and aluminum. When coal and oilare co-refined, the catalyst and sulfur powder are added into a coal and oil mixed slurry, and vulcanized at 90-150 DEG C to obtain the vulcanized catalyst. According to the method, urea is used as a precipitant, after urea is dissolved, ammonia can be slowly and uniformly released in a solution by controlling the decomposition temperature of urea, and iron ions and auxiliary metal ions are uniformly and slowly co-precipitated into nanoparticles; meanwhile, excessive urea is added, so that the specific surface area and the pore volume of the catalyst can be improved in the later use process.