The present invention relates to mechanical rice seedling growth of rice and environmentally friendly planting rice seedling raising tray. The rice seedling growing container tray consists of rice straw pulp 45-65 wt%, paper pulp 25-35%, fertilizer 0.3-3 wt%, rosin 0.3-2 wt%, bauxite 5-15 wt%, etc. The tray structure includes rectangular tray, conic bodies connected to the tray and distributed inequal distances, seedling growing holes coaxial with the conic. The tray together with the soil-less rice seedlings are transplanted on the rice field and can protect rice seedling root system while providing the rice seedlings with nutrients.