Fuente: WIPO "industrial hemp" The invention discloses an industrial hemp special foliar fertilizer for converting female plants and a preparation method thereof, and belongs to the technical field of fertilizers. The industrial hemp special foliar fertilizer comprises sodium naphthalene acetate, indoleacetic acid, polyglutamic acid and an ammonium nitrate solution, and the mass ratio of sodium naphthalene acetate to indoleacetic acid to polyglutamic acid to the ammonium nitrate solution is 1: 1: 800: 150. The industrial hemp special foliar fertilizer can convert male plants into female plants, the conversion rate is 100%,the number problem of the female plants is solved to the maximum extent, annual cost investment is reduced, output benefits are increased, the phenomenon of female pollination is avoided effectively,the hidden danger that CBD disappears after female pollination is eradicated. Plants sprayed with the industrial hemp special foliar fertilizer are dark green in leaf color, thick and strong in stem,multiple in flower bud differentiation and thick and strong in root system and have more white roots, and great contribution is made to production of industrial hemp medical cannabis sativa.