Preparation method of ecological liquid fertilizer taking anaerobic fermentation liquid as basic liquid

The invention relates to a liquid fertilizer, and specifically relates to a water soluble liquid fertilizer containing macroelements, wherein anaerobic fermentation liquid is taken as the basic liquid of the fertilizer. In the prior art, the liquid fertilizer production has the disadvantages of large water consumption, high production cost, and single functional product. In order to solve the problems mentioned above, a formula of a water soluble liquid fertilizer is designed, the fermentation liquid is taken as the basic liquid, macroelements (N, P, and K), medium elements (Mg and Ca), microelements (Zn, Fe, B, Mo, and Mn) and organic substances are compounded and added, thus the liquid fertilizer has a comprehensive nutrients and is capable of supplying sufficient nutrition, moreover, the water resource is saved, and the raw material cost is reduced. The anaerobic fermentation liquid is subjected to secondary fermentation and is fully aged so as to kill the harmful bacteria and insect eggs, while at the same time the original active substance and beneficial bacterium colonies are preserved. The fertilizer can release the soil fertility, can be easily absorbed by the plants, is capable of promoting the plant growth, has the advantages of high nutrient content, comprehensive functions, environment-friendliness, low production cost, and user-friendliness, and is capable of increasing the crop yield and improving the agricultural product quality after long term use.