The invention discloses a plant nutrient solution, the plant nutrient solution is prepared from the following materials: 10-20 parts by weight of humic acid, 2-5 parts by weight of feather extract, 1-5 parts by weight of shrimp and crab shell extract, 2-5 parts by weight of selenium rich seaweed extract, 0.5-2 parts by weight of amino acid chelated trace elements, 1-5 parts by weight of houttuynia extract, 1-5 parts by weight of banana peel extract, 0.1-0.2 part by weight of matrine, 0.1-0.5 part by weight of polyvitamin, 1-2 parts by weight of negative ion powder and 300-1000 parts by weight of water; the plant nutrient solution provides organic nutrients for plants, and promotes the transformation of plant organic matters, and the negative ion powder is added into the plant nutrient solution to release negative ions so as to promote plant uptake of nutrients and improves the utilization rate of the plant nutrient solution.