Tomato pollution-free cultivation method

The invention discloses a tomato pollution-free cultivation method. The method comprises the following steps of 1, preparation before seeding, wherein according to soil conditions, a field which has the flat terrain and the fertile soil texture and where drainage and irrigation can be performed conveniently and no solanaceae is planted within three years is selected as a planting base, and a sufficient amount of base fertilizer is applied; seed treatment, wherein a potassium permanganate solution is selected for soaking seeds, the seeds are cleaned with clean water after being soaked thoroughly, the cleaned seeds are placed into a warm water basin to be soaked, and the seeds are subjected to bud forcing treatment; 2, strong seedling cultivation, wherein nutrient soil is prepared and uniformly scattered to a seedbed, the seeds are sown, and when the seedlings grow to two main leaves, fertilization is performed; 3, field planting, wherein field planting is performed when the seedlings grow to five to six leaves