Application of syringic acid in herbicide for preventing and controlling agricultural weeds

The invention discloses application of syringic acid in a herbicide for preventing and treating agricultural weeds, wherein the herbicide is used for preventing and treating the agricultural weeds, the active ingredient of the herbicide is syringic acid, and the concentration is 0.5-10 mg/mL; herein, the agricultural weeds are one or more of barnyard grass, cyperus rotundus, sudangrass, abutilon fiber, edible amaranth, moleplant seed, amaranthus retroflexus, water barnyard grass, eleusine indica, digitaria sanguinalis and spermacoce latifolia. The syringic acid has a remarkable inhibition effect on agricultural weeds, and a natural-source weeding active substance is provided for prevention and control of the agricultural weeds; the syringic acid can be used for preventing and treating various important agricultural weeds such as abutilon fiber, barnyard grass and edible amaranth; when the syringic acid is used as a herbicide, the characteristics of high efficiency, low toxicity, safety and the like can meet t