NOVELTY - Fermented sludge containing fertilizer additive comprises rice husk, sewage sludge, chitosan, polyglutamate, humic acid, chaff, oriental wormwood, southernwood, radix sophorae flavescentis, dogwood, food waste, chicken manure, ammonium molybdate, cobalt sulfate heptahydrate, sodium acetate, betaine, copper acetate, pentadecyl sulfonyl chloride, nitrification inhibitor 3,4-dimethylpyrazole phosphate, and sodium dodecylbenzenesulfonate.    USE - Fermented sludge containing fertilizer additive.    ADVANTAGE - The additive is nutritious, can remove or kill harmful substances, and has moisture holding function.    DETAILED DESCRIPTION - Fermented sludge containing fertilizer additive comprises 20-25 pts. wt. rice husk, 10-12 pts. wt. sewage sludge, 1-4 pts. wt. chitosan, 0.4-0.5 pt. wt. polyglutamate, 1-2 pts. wt. humic acid, 10-15 pts. wt. chaff, 4-6 pts. wt. oriental wormwood, 1-2 pts. wt. southernwood, 1-2 pts. wt. radix sophorae flavescentis, 2-3 pts. wt. dogwood, 3-4 pts. wt. food waste, 10-20 pts. wt. chicken manure, 0.01-0.002 pt. wt. ammonium molybdate, 0.002-0.003 pt. wt. cobalt sulfate heptahydrate, 0.5-1.8 pts. wt. sodium acetate, 0.1-0.3 pt. wt. betaine, 0.2-0.3 pt. wt. copper acetate, 0.3-0.5 pt. wt. pentadecyl sulfonyl chloride, 1-2 pts. wt. nitrification inhibitor 3,4-dimethylpyrazole phosphate, and 1-2 pts. wt. sodium dodecylbenzenesulfonate. An INDEPENDENT CLAIM is included for preparation of additive comprising drying rice husk and chaff until moisture content of less than 20%, thermal cracking, carbonizing at 400-500 degrees C, cooling, grinding, sieving through 1 mm sieve to obtain biomass at particle diameter of less than 1 mm; sieving, mixing with sewage sludge, stirring, washing with water to remove surface dust and impurities, adding 5-8% hydrochloric acid solution at mass ratio of 1:1.5-2.5, mixing, soaking at room temperature for 15-18 hours, separating solid and liquid, drying resulting powder, and performing UV radiation for 10-12 hours to obtain mixed modified material; dissolving sodium dodecylbenzenesulfonate in water, spraying on mixed modified material, and drying to obtain modified mixed powder; mixing oriental wormwood, southernwood, radix sophorae flavescentis and dogwood, boiling to obtain medicine liquid and dregs, mixing chitosan and water, adding medicine liquid and betaine, and stirring at 100-200 revolutions/minute for 10-20 minutes to obtain complex sterilizing solution; and mixing medicine dregs, humic acid, food waste and chicken manure, fermenting at 40-50 degrees C for 1-2 days, turning, open-air composting for 6-12 days, air-drying, and mixing with modified mixed powder, complex sterilizing solution and remaining raw materials.