The invention provides a
barley grass nutrient solution preparation method which comprises the following steps: S101, constructing an experimental subject and a corresponding sample set, S102, detecting specific elements in the sample set, S103, calculating the apparent absorptivity of
livestock to the specific elements and the total amount of the specific elements required for the growth of the
livestock, and S104, performing experimental determination on the total amount of the specific elements required for the growth of the
livestock under a clear water culture condition. The method comprises the following steps: S105, determining the content of specific elements of barley seeds after the barley seeds are converted into
barley grass, S105, determining the enrichment capacity and the maximum critical concentration of the
barley grass on the specific elements under the culture condition of a
nutrient solution through experiments, S106, calculating the concentration range of the specific elements in the
nutrient solution, and S107, calculating the optimal concentration of the specific elements in the
nutrient solution. The method has the beneficial effects that the green barley grass feed is taken as a carrier, the trace elements in the
animal product are rapidly supplemented by detecting the trace elements in the
animal product, calculating the optimal concentration of the trace elements in the
nutrient solution and timely adjusting the preparation of the
nutrient solution, and finally, the quality and efficiency of the
animal product are improved.