NOVELTY - A liquid fertilizer comprises 4-5 pts. wt. calcium oxide, 8-10 pts. wt. urea, 2-4 pts. wt. zinc sulfate, 2-3 pts. wt. cupric sulfate, 6-7 pts. wt. garlic, 1-2 pts. wt. chloroethanol, 8-10 pts. wt. maple syrup, 3-4 pts. wt. peat, 4-8 pts. wt. Lotus leaves, 4-5 pts. wt. weathered coal, 3-4 pts. wt. boric acid, 0.1-0.2 pt. wt. EDTA, 0.2-0.3 pt. wt. fresh green pigment, 2-4 pts. wt. phosphorite, and 8-12 pts. wt. complexing agents.    USE - Liquid fertilizer used for improving soil fertility (claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of liquid fertilizer comprising mixing weathered coal, peat, and phosphorite, adding water at mass ratio of 1:200-250, uniformly stirring for 50-60 minutes, filtering to obtain nutrient solution A, standing, mixing garlic and Lotus leaves, grinding for 20-40 minutes, filtering slurry, mixing calcium oxide, urea, zinc sulfate, cupric sulfate, boric acid, and EDTA, thoroughly mixing, adding water at mass ratio of 1:260-300, heating at 60-80 degrees C for 1 hour, cooling, adding fresh green pigment, chloroethanol, maple syrup, stirring for 40-50 minutes, filtering to obtain nutrient solution B, standing, mixing nutrient solutions A and B, and remaining raw materials, filtering, weighing, and packaging; (2) composition of complexing agent comprising 6-8 pts. wt. turtle shell, 4-6 pts. wt. yellow horns, 3-5 pts. wt. amino acid-chelated calcium, 3-5 pts. wt. amino acid-chelated manganese, 3-5 pts. wt. amino acid-chelated zinc, 3-5 pts. wt. amino acid-chelated magnesium, 3-5 pts. wt. EDTA-chelated iron, 4-7 pts. wt. rare earth element, 3-4 pts. wt. effective microbial agents, 8-14 pts. wt. aquaculture waste, 15-20 pts. wt. bird manure, 5-7 pts. wt. barley insect powder, 3-4 pts. wt. volcanic rocks, and 2-3 pts. wt. ferrochrome spinel; and (3) preparation of complexing agent comprising mixing aquaculture waste, bird manure, barley insect powder, and effective microbial agents, performing controlled aerobic fermentation at moisture content of 30-50% for 3-5 days, covering with plastic film, anaerobic fermenting for 6-10 days, standing for 3-5 hours, filtering fermentation liquid, standing, mixing turtle shell, and yellow horns, adding phosphoric acid, hydrolyzing, completely dissolving, adding lime, dissolving, filtering to obtain solution A, mixing rare earth element, volcanic rock, and ferrochrome spinel, grinding into powder, adding water at mass ratio of 1:300-400, stirring for 2-3 hours, filtering to obtain solution B, mixing amino acid-chelated calcium, amino acid-chelated manganese, amino acid-chelated zinc, amino acid-chelated magnesium, and EDTA-chelated iron, adding water at mass ratio of 1:200-300, stirring at 40-60 degrees C for 90-120 minutes, filtering to obtain solution C, and mixing solutions A, B, and C.