The invention discloses a high-yield cultivation method for broomcorn millet. The high-yield cultivation method comprises the first step that 1, stubble selection and soil preparation are carried out,a self-made base fertilizer is applied in furrows, and ridging is carried out; 2, broomcorn millet seeds and allium bidentatum seeds are treated before sowing; 3, sowing is carried out at proper time, and a special water-retaining agent special for the broomcorn millet is applied in the furrows; 4, field management and pest control are carried out; 5, timely harvesting is carried out. According to the high-yield cultivation method for the broomcorn millet, the self-made base fertilizer is applied in the furrows, the fertilizer required in the early stage of development of the broomcorn milletis sufficiently applied at a time, element sources such as silicon, boron, zinc and selenium are supplemented, growth and development of the broomcorn millet are facilitated, and the nutritive valueof the broomcorn millet is improved. Through allium bidentatum intercropping, volatile substances generated in the growth process of allium bidentatum are utilized, and damage of aphids to the growthof the broomcorn millet is effectively prevented, so that occurrence of red leaves of the broomcorn millet is reduced. Particularly, the special water-retaining agent for the broomcorn millet is applied in the furrows, so that long-acting water control and fertilizer control are realized, the broomcorn millet loss caused by droughts is reduced, and the comprehensive output of the broomcorn milletand the farmland is improved.