The invention relates to a controlled-release bulk blending fertilizer for complete-quantity fertilizing and clean production of rice, and preparation and application methods. The controlled-release bulk blending fertilizer is especially applicable to Yellow River irrigation areas, and is characterized by comprising the compositions in parts by weight, 25-27 parts of urea, 40-42 parts of controlled-release coated urea, 12-14 parts of calcium triple superphosphate, and 19-21 parts of potassium chloride. The controlled-release bulk blending fertilizer has the beneficial effects that the fertilizer is prepared according to nutrient demands of crops, requirements for the production technology and equipment are simple and operatability is high; no fixed input is needed, and the controlled-release bulk blending fertilizer is prepared by adding ready-made fertilizer components into the controlled-release coated urea which is simply produced through a pan granulator, and performing physical mixing through a stirrer or an intelligent fertilizer blending machine; the production technology is simple, employed equipment requires less land occupation, and equipment investment is 20-30% of that of common composite fertilizer production equipment.