NOVELTY - Sustained release additive comprises food waste, bentonite, corn stalk, dimethylpyrazole phosphate (DMPP) as nitrification inhibitor, glucose, citric acid, peat, ferrous sulfate, bagasse, biogas slurry, naphthalene, glycerin monostearate, nightshade, Celastrus orbiculatus, Arabidopsis thaliana, Hedyotis chrysotricha, Aconitum naviculare, garden burnet and sodium dodecylbenzenesulfonate.    USE - Sustained release additive (claimed).    ADVANTAGE - The sustained release additive recycles waste into treasure, and improves soil compaction.    DETAILED DESCRIPTION - Sustained release additive comprises 10-15 pts. wt. food waste, 3-6 pts. wt. bentonite, 10-20 pts. wt. corn stalk, 0.4-0.7 pt. wt. dimethylpyrazole phosphate (DMPP) as nitrification inhibitor, 1-2 pts. wt. glucose, 1-2 pts. wt. citric acid, 1-2 pts. wt. peat, 0.5-0.8 pt. wt. ferrous sulfate, 10-14 pts. wt. bagasse, 4-6 pts. wt. biogas slurry, 1-1.5 pts. wt. naphthalene, 1-2 pts. wt. glycerin monostearate, 1-3 pts. wt. nightshade, 2-5 pts. wt. Celastrus orbiculatus, 3-4 pts. wt. Arabidopsis thaliana, 1-2 pts. wt. Hedyotis chrysotricha, 1-2 pts. wt. Aconitum naviculare, 1-2 pts. wt. garden burnet and 0.5-0.8 pt. wt. sodium dodecylbenzenesulfonate. An INDEPENDENT CLAIM is included for method for preparing sustained release additive, which involves (a) collecting food waste, dehydrating until moisture content reduced to 20%, and performing pyrolysis at 400-500 degrees C, cooling pyrolyzed dehydrated material, grinding and sieving using size of 1 mm mesh to obtain biomass charcoal having diameter of less than 1 mm, (b) adding biomass charcoal with bentonite, stirring uniformly and washing mixture with water to remove impurities, mixing resultant mixture and 5-8% concentration of hydrochloric acid solution in a mass ratio of 1: 1.5-2.5, soaking mixture at room temperature for 15-18 hours, and carrying out solid-liquid separation and drying to obtain mixed powder, and UV irradiating mixed powder for 10-12 hours to obtain mixed modified materials (c) dissolving sodium dodecylbenzenesulfonate in water, resulting solution is sprayed on mixed modified materials, and drying to obtain mixed modified powder, (d) mixing nightshade, C.orbiculatus, A.thaliana, H.chrysotricha and A.naviculare, extracting mixture and filtering to obtain residues and traditional Chinese medicine, adding water to glucose, mixing uniformly and adding traditional Chinese medicine and glycerin monostearate, centrifuging mixture at a speed of 100-200 revolutions/minute for 10-20 minutes, to obtain anti-pest complex liquid and (e) mixing residues, peat, bagasse and corn flour, fermenting mixture at high temperature of 50-60 degrees C for 10-12 hours, composting fermented mixture in open air for 6-12 days, mixing mixed modified powder, anti-pest complex liquid and remaining raw materials uniformly to obtain product.