The invention provides a rice seedling growth method, comprising the steps of (1) preparing a growth medium, made from, by weight, 80-90 parts of straws, 10-20 parts of straw char, 5-15 parts of animal excrement, 5-15 parts of slag, 0.04-0.05 part of a fermenting bacterium, and 0.8-72 parts of water; (2) dividing the growth medium into two parts, mixing one part with charcoal-base fertilizer, using the mixture as covering earth, and using the other part as culture earth; seeding in the culture earth, covering the surface of seeds with the covering earth, and spraying an aqueous solution of wood vinegar; (3) after the seeds grow seedlings, scattering charcoal-based fertilizer, and spraying the aqueous solution of wood vinegar. The soilless culture medium herein causes less environmental pollution due to straw incineration, the problems are effectively solved, such as difficulty in collecting seedling growth soil from saline-alkaline soil, shortage of bed soil resources and high growth cost, and a new way is provided for the development of seedling growth techniques to harmless, low-cost and low-carbon trend.