Amino acid foliar fertilizer capable of increasing capsaicin content of crops as well as preparation method and application of amino acid foliar fertilizer

The invention provides an amino acid foliar fertilizer for increasing the capsaicin content of crops and a preparation method and application thereof.The amino acid foliar fertilizer is prepared from, by weight, 50-60 parts of calcium chloride, 6-8 parts of potassium chloride, 40-60 parts of magnesium chloride, 8-12 parts of monopotassium phosphate, 8-9 parts of ammonium molybdate, 2-4 parts of boric acid, 15-25 parts of L-threonine, 25-35 parts of L-leucine and 30-50 parts of L-histidine. And 990 to 1010 parts of water. The L-threonine, the L-leucine and the L-histidine in the amino acid foliar fertilizer are mutually cooperated and jointly synergized, the yield of pepper crops and the capsaicin content are remarkably improved, and the amino acid foliar fertilizer can provide nutrients for the crops and is fast in nutrient absorption, good in fertilizer efficiency, high in pertinence, high in fertilizer utilization rate, short in implementation time, easy to operate and remarkable in economic benefit. 本发明提供一