The invention discloses a preparation method of a Camellia oleifera fertilizer with high utilization rate. The method comprises the following steps: bentonite, Chinese medical stone powder, and diatomite are mixed and grinded, water, brassinolide, mint essential oil, and forchlorfenuron are added with stirring, and spray drying is carried out in order to obtain a first material; turfy soil, coppersulphate, magnesium nitrate, gypsum powder, and wollastonite powder are mixed, and water is added with uniform mixing in order to obtain a second material; biogas residues, cassava residues, cottonseed meal, fermented peanut meal and wheat bran are added into the first material with mixing, water is added with uniform mixing, a second material, urea, potassium nitrate, and diammonium phosphate are added with uniform mixing, granulation is carried out, and drying is carried out in order to obtain the Camellia oleifera fertilizer with high utilization rate.