The invention discloses a Leymus chinensis seed germinator, which is prepared from the following raw materials by weight: 24-26 parts of biogas residue, 10-12 parts of ears of sorghum, 5-6 parts of crude wood vinegar, 3-4 parts of micro silica, 2-3 parts of silica fume, 3-4 parts of polyethylene glycol, 55-56 parts of fresh Eupatorium adenophorum, 16-17 parts of fresh oyster, 1.3-1.5 parts of Pseudomonas aeruginosa microbial inoculum, 2.2-2.4 parts of high-temperature cellulolytic decomposer microbial inoculum, a proper amount of 6mol / L HCl solution and a proper amount of water. Aiming at low germination rate of Leymus chinensis seed, polyethylene glycol dissolve the organic matter layer such as a wax layer on the seed surface, so as to improve external material exchange ability of the seed with the outside, promote seed germination, significantly improve the germination rate of Leymus chinensis seeds and greatly promote large-scale cultivation of Leymus chinensis.