The invention relates to a breeding method of special foxtail millet for forage grass. The breeding method specifically comprises steps as follows: firstly, weed-associated wild foxtail which has high, strong and upright plants, tillers, more dark green leaves without disease spots and more straw, grows well and does not wilt is selected from a foxtail millet field; then 6-8 generations of head row breeding is performed on the foxtail with a planting method for breeding the special foxtail millet for forage grass, and the special foxtail millet for forage grass is bred and has the advantages that the stable foxtail millet has high, strong and upright plants, tillers, more dark green leaves without disease spots and more straw, grows well and does not wilt, the content of crude protein, rude fat and crude fiber of straw is high and the like. The method is simple and easy to operate, has a stable effect, is sustainable and achieves the purpose of economy and high efficiency; under the condition of shortage of labor force and continuous increase of the cost, the scheme is suitable for popularization and application.