NOVELTY - Making chitosan enveloped seaweed microbial organic fertilizer, involves breaking seaweed body, adding water and performing secondary immersing treatment, hydrolyzing acid solution for seaweed slag, centrifuging and concentrating to form seaweed extract liquid; combining fresh seaweed with seaweed slag, chicken manure, straw, peanut hull and fermentation bacterium agent, performing aerobic fermentation, adding nitrogen-phosphorus-potassium, trace element and functional bacteria, and combining with seaweed extract; and spraying chitosan and sodium alga acid solution to fertilizer.    USE - For preparing chitosan enveloped seaweed microbial organic fertilizer (claimed).    ADVANTAGE - The chitosan enveloped seaweed microbial organic fertilizer can slow down the released nutrition; satisfies the requirements of plants at different growth stage; generates the obvious active effect on improving the maturity, output and quality of crops and resisting plant diseases and insect pests; improves the utilization rate of nutrition by crops; provides durability and availability of the effective component; provides soil breathing and gathering abilities; and obviously accelerates the formation of soil cluster structure.    DETAILED DESCRIPTION - Preparation of chitosan enveloped seaweed microbial organic fertilizer, involves (A) after taking seaweed, removing impurity and cleaning, pressing and breaking the seaweed body, adding water and performing the secondary immersing treatment, hydrolyzing the acid solution for seaweed slag, centrifuging the hydrolysate and removing salt, combining and concentrating immersing fluid and hydrolysate to obtain the extract liquid of seaweed physical active matter; (B) combining the fresh seaweed with seaweed slag in step (A), stacking rot, after breaking, adding chicken manure, straw and peanut hull, after mixing evenly, adding fermentation bacterium agent, performing the aerobic fermentation, after finishing the fermentation, adding nitrogen-phosphorus-potassium, trace element and functional bacteria, and combining with the seaweed extract liquid, freezing and drying; and (C) respectively spraying chitosan and sodium alga acid solution to the seaweed microbial organic fertilizer obtained in step (B), forming the chitosan enveloped seaweed microbial organic fertilizer, where the functional bacteria comprises at least one Bacillus subtilis, Bacillus Licheniformis, Bacillus megaterium and Bacillus mucilaginosus.