The invention relates to a method for simply granulating phosphate fertilizer, which aims to solve the problems of difficult granulation, inconvenient transportation and use, and the like in the production process of the phosphate fertilizer. The method mainly comprises humidification processing, slope roller granulation and packaging for storage of finished products. The method comprises the following steps of: 1. spraying 20-30 percent of water to powdered phosphate fertilizer and uniformly stirring; 2. placing the humidified phosphate fertilizer into a slope roller granulator rotating at constant speed, wherein after the humidified phosphate fertilizer rotates to the upper part from the lower part of the slope along a roller under the condition of continuous rotation of the roller, fine particles of the phosphate fertilizer can roll along the slope and then rotate to the upper part along the roller, the operation is circulated till the particles are bigger and bigger, and the granular particle fertilizer can roll from the slope formed by the powdered fertilizer positioned under the slope under the action of the slope and fall into a material conveying bucket at the lower side of the slope roller; and conveying the fertilizer to a split workshop and packaging for storage.