NOVELTY - The high concentration ecological fertilizer comprises ecological compound fertilizer semi-finished product as a core. The semi-finished product is coated with organic coating liquid, plant probiotics, middle element additive and microelement additive. The organic coating liquid comprises 20-50 wt.% of organic matter, 1-5 wt.% of nitrogen and 1-5 wt.% of potassium, where the semi-finished product, organic coating liquid and plant probiotics is mixed at a weight ratio of 996-980:5-20:1-5.    USE - The high concentration ecological fertilizer is useful as a base or additional fertilizer for cultivating wheat, corn, rice, fruits and vegetables (all claimed).    ADVANTAGE - The high concentration ecological fertilizer improves the growth, drought resistance, yield and quality of the crop, enhances water absorption capacity and fat absorption ability of the plant, reduces the decomposing rate of the pesticide, the pesticide effect and dosage, and exhibits improved safety of the agricultural products and reduced environment pollution.    DETAILED DESCRIPTION - The high concentration ecological fertilizer comprises ecological compound fertilizer semi-finished product as a core. The semi-finished product is coated with organic coating liquid, plant nitrogen fixation type probiotics, middle element additive and microelement additive. The organic coating liquid comprises 20-50 wt.% of organic matter, 1-5 wt.% of nitrogen and 1-5 wt.% of potassium, where the semi-finished product, organic coating liquid and plant probiotics is mixed at a weight ratio of 996-980:5-20:1-5. The ecological fertilizer is prepared by extracting lignite using 15-30% concentration of potassium hydroxide solution, adding 1-5 parts by weight (pbw) of magnesium sulfate, 10-20 pbw of zinc sulfate, 2-10 pbw of manganese sulfate, 1-5 pbw of borate and 1-5 pbw of copper sulfate with the extracted lignite, uniformly stirring the mixture to obtain an organic activated solution A, mixing phosphoric acid with potassium persulfate, putting the mixture into forced circulation ammonia neutralizer, controlling the mixture and ammonia gas to a molar ratio of 1:1-1.6 for performing neutralization reaction to obtain a compound fertilizer slurry B, adding the obtained compound fertilizer slurry B with the organic activating solution A with a volume ratio of 100:8-20, concentrating the mixture using a two-effect tubular heater to obtain a concentrated slurry C, pumping the concentrated slurry C into a secondary forced circulation ammonia neutralizer for neutralization reaction, controlling the slurry C and gas ammonia with a mole ratio of 1:1.2-1.95, and drying and sieving the concentrated slurry C mixture to obtain high concentration ecological fertilizer. An INDEPENDENT CLAIM is included for a method of preparing high concentration ecological fertilizer.