The invention discloses a process method for preparing a biological fertilizer by utilizing hickory hulls. The process method comprises the following steps of: 1-, grinding the hickory hulls into powder; 2-, mixing the hickory hull powder with biological rubbish in proportion, and then, evenly stirring; 3-, delivering the material evenly stirred in the step 2 into a fermentation tank and fermenting; 4-, pelleting the fermented material; 5-, performing membrane-forming polishing on particles made in the step 4; 6-, screening the particles made in the step 4; collecting qualified products, and delivering unqualified products back and pelleting for the second time; 7-, drying the qualified fertilizer made in the step 5, and cooling the dried fertilizer to normal temperature; and 8-, delivering the cooled fertilizer into a vibrating screen to screen out the unqualified fertilizer and pelleting for the second time; packaging the qualified fertilizer and delivering into a finished product warehouse. The process method disclosed by the invention is simple and convenient in flow, low in cost, high in use ratio on the hickory hulls and can be easily put into industrial production, and the environmental pollution is reduced.