The invention has supplied biological leaf fertilizer, whose characteristics is that it includes chemical agent, biological organic matter, chelating agent, penetrant and microbe fermentation liquor and the solid raw material and mess ratio are: urea50-55%, potassium dihydrogenphosphate20-25%, potassium chloride 7-8%, boric acid0.3-0.5%, boric acid0.2-0.4%, copper sulfate0.1-0.2%, calcium nitrate0.5-1.5%, magnesium sulfate0.2-0.4%, zinc sulfate0.2-0.4%, manganese sulphate0.2-0.3%, ammonium molybdate0.05-0.1%, fulvic acid14-15%, EDTA chelating agent1-2%, AEO-20 penetrant 0.05-0.1%, mix the raw material of the above mix water 160~70deg.C in the ratio of 2:3, after 24 hours, add microbe fermentation liquor into the liquid filtered by 0.5~1mL / kg, then adjust the PH value to 5.0~6.0, finally, obtain the invention. The leaf fertilizer contains lots of macroelements and all kinds of secondary and microelements, and also contains metabolic product of microbe fermentation, beneficial microbe flora,chelating agent, penetrant and growth regulating agent, without poison, smell and side effect, it is safe and reliable, can increase the quantity and quality of agricultural products.