NOVELTY - Aquiculture fertilizer comprises Bacillus subtilis spores, Bacillus licheniformis spores, Lactobacillus, rapeseed oil residue, oyster powder, carrier, sucrose, sodium nitrophenolate and sodium humate, where the carrier includes rice bran, wheat bran and peanut cake, and the mass ratio of the: Bacillus subtilis spores, Bacillus licheniformis spores and Lactobacillus, and rapeseed oil residue is 0.04-0.06:1; rapeseed oil residue and carrier is 0.5-0.8:1; sugar and rapeseed oil residue is 0.06-0.08:1.    USE - Aquiculture fertilizer.    ADVANTAGE - The aquiculture fertilizer can: be prepared with antibacterial sterilization function; and promote the healthy and sustainable development of aquaculture in green.    DETAILED DESCRIPTION - Aquiculture fertilizer comprises Bacillus subtilis spores, Bacillus licheniformis spores, Lactobacillus, rapeseed oil residue, oyster powder, carrier, sucrose, sodium nitrophenolate and sodium humate, where the carrier includes rice bran, wheat bran and peanut cake, and the mass ratio of the: Bacillus subtilis spores, Bacillus licheniformis spores and Lactobacillus, and rapeseed oil residue is 0.04-0.06:1; rapeseed oil residue and carrier is 0.5-0.8:1; sugar and rapeseed oil residue is 0.06-0.08:1; sodium natrophenolate or sodium humate, and rapeseed oil residue is 0.07-0.09:1; and oyster powder and rapeseed oil residue is 0.1-0.2:1. An INDEPENDENT CLAIM is included for preparing aquiculture fertilizer comprising (a) extracting and isolating the Bacillus subtilis spores, Bacillus licheniformis spores and Lactobacillus at 25-36 degrees C and then culturing and purifying to obtain purified product and then drying at 18 degrees C into powder, (b) adding rapeseed oil residue, oyster powder, carrier, sucrose, sodium nitrophenolate and sodium humate in a mixer and then mixing, stirring and crushing into powder, (c) filtering the obtained powder in step (b) in a dryer and then drying at 120-150 degrees C for 12-17 minutes to obtain mixed oyster powder, and (d) adding the obtained powder in step (a) and mixed oyster powder in step (c) and then stirring and fermenting in a fermentation tank at 22-29 degrees C for 7-9 days, taking out the fermented mixture and then filtering and drying.