NOVELTY - A slowly released phosphatic fertilizer comprises powdered rock phosphate, biological bacterium controlled release agent, calcium magnesium phosphatic fertilizer and bentonite, where the powdered rock phosphate is prepared by grinding phosphorus-containing phosphate rock through a crusher and ball mill, the biological bacterium controlled release agent is prepared by using raw material comprising chicken, lees, bagasse, coal gangue and sludge.    USE - Slowly released phosphatic fertilizer    ADVANTAGE - The fertilizer has controlled release speed of nutrients, better salt resistance, better drought resistance, better lodging resistance and continuous cropping resistance of crops.    DETAILED DESCRIPTION - A slowly released phosphatic fertilizer comprises 40-60 pts. wt. powdered rock phosphate, 10-15 pts. wt. biological bacterium controlled release agent, 20-40 pts. wt. calcium magnesium phosphatic fertilizer and 7-10 pts. wt. bentonite, where the powdered rock phosphate is prepared by grinding 12-16% phosphorus-containing phosphate rock through a crusher and ball mill to 90-100 mesh fineness, the biological bacterium controlled release agent is prepared by using raw material comprising 15-25 wt.% chicken, 10-15 wt.% lees, 15-20 wt.% bagasse, 15-20 wt.% coal gangue and 25-35 wt.% sludge, followed by mixing the raw material to obtain mixture, subjecting the mixture to high temperature drying and sterilizing process, controlling water content of the mixture to 8-10%, grinding the mixture to 90-100 meshes powder, adding the powder with strain material and placing in a fermentation tank for fermentation, controlling the temperature of the fermentation tank at 20-30 degrees C and humidity at 15-20%, turning the mixture once for every 48 hours for 3 times to obtain the release agent comprising 0.2-0.3 wt.% mycorrhizal fungi, 0.2-0.3 wt.% Bacillus subtilis, 0.2-0.3 wt.% Bacillus megaterium, 0.2-0.3 wt.% Bacillus mucilaginosus, 0.2-0.4 wt.% Azotobacter, 0.2-0.4 wt.% Bacillus licheniformis and 0.3-0.5 Streptomyces and 15-16% phosphorus content of calcium-magnesia phosphate fertilizer, and the bentonite has particle size of 20-130 mesh. An INDEPENDENT CLAIM is also included for a method for preparing a slowly released phosphatic fertilizer.