The invention discloses a cultivation method for greening lawn. The method is used for the cultivation of the lawn by using planting boxes containing planting troughs. The method comprises the following steps: (1) laying a plastic film at the connecting position of the edges and the bottom of every planting trough (2) laying cultivation soil in every planting trough, evenly broadcasting mixed grass seeds on the cultivation soil, covering the cultivation soil with plant ash, rolling the covered soil to flatten the soil, and covering the flattened soil with a layer of rice straws; (3) performingwatering, and placing the planting boxes in a culture room; 4) controlling the temperature of the culture room to be 7-9 DEG C, performing watering every 4-6 days, and controlling the watering humidity to be 40% or below; (5) controlling the temperature of the culture room to be 12-15 DEG C, keeping the temperature for 10-12 days, and performing watering every 3 days during temperature keeping; and (6) controlling the temperature of the culture room to be 18-20 DEG C, and performing watering every day in the process. The method using seasonal simulation to carry out lawn cultivation has the advantages of high lawn cultivation speed, unified lawn growth speed, and convenience in enforcement of the lawn cultivation.