The invention provides an amino acid foliar fertilizer, comprising the following materials in percentage by mass: 30 to 50 percent of plant amino acid, 1 to 5 percent of compound sodium nitrophenolate, 15 to 25 percent of urea, 5 to 10 percent of ferrous sulphate, 5 to 10 percent of borax, 3 to 5 percent of cupric sulfate, 0.1 to 1 percent of ammonium molybdate, 1 to 2 percent of manganese sulfate, 4 to 8 percent of zinc sulfate, 10 to 20 percent of organic silicon, and the balance water. The amino acid foliar fertilizer has obvious effects of exciting activity of enzyme in crops, improving the photosynthetic efficiency of the crops, accelerating nutrition absorption and operation inside the crops, increasing the content of chlorophyll, improving stem substance accumulation and sugar content, improving crop quality, and enhancing crop drought resistance, disease resistance and immunity and the like, can be absorbed by leaves, stems and roots of various commercial crops, such as Chinese cabbages and other vegetables, so as to lead the crops to be higher, and has remarkable effect in enhancing the performances of root growth, sprouting, seedling strengthening, flower promoting, fruit swelling, fruit protecting and other aspects for the crops.