The invention discloses a swamp cabbage planting method. The planting method comprises the steps of seedling bed preparation, seed soaking, seedling bed treatment, sowing, planting management and harvesting. Chicken manure serves as a fertilizer, various nutritional ingredients are provided, a decomposition agent and a thin film are combined to act so that the temperature rising speed of the compost is increased, quick fermentation of the fresh chicken manure is promoted, the composting time is reduced, the decomposition effect of the compost is improved, insect pest eggs and harmful germs are killed thoroughly, diseases and insect pests are completely eradicated, and the quality of the organic fertilizer is ensured. Saccharomycetes, lactic acid bacteria, nitrogen-fixing bacteria, cellulose decomposition bacteria and actinomycetes are adopted to serve as additives in the method. The loss of Nitrogen elements is controlled, the compost effect is improved, and a good effect on accelerating the completion of the compost is achieved; rapid conversion of easily degradable organic matter, the stabilization of the organic matter and the formation of humus are achieved, so that the passivation effect on heavy metals is achieved, the content of the heavy metals in swamp cabbages is effectively reduced, and a guarantee is provided for food safety.