A method for making alfalfa grassland full-view specimens based on biological plasticization, collecting complete and leafy alfalfa specimens, including leaves, stems, roots, and whiskers. After sorting, iron wires are inserted into the stems, and multi-layer The shape of the alfalfa grass is supported by the inclined funnel-shaped support platform; it is treated with the stem and leaf treatment liquid and the root treatment liquid; plasticized silica gel is put into it, plasticized under the negative pressure of the vacuum box, and then put into the vacuum chamber, and cured with the curing agent organotin , the specimen takes shape. The alfalfa of the invention has a complete and beautiful structure, clear and natural shape and position, can maintain the original bright colors of the plant, can be used for teaching, exhibition and science popularization, and can make up for the shortcomings of fresh and soaked specimens that are irritating in smell, difficult to preserve, and difficult to transport.