The invention provides a rainproof tomato cultivation method and relates to the technical field of tomato cultivation. The method comprises the steps of seedling raising, soil preparation, making of rectangular land pieces, fertilization, mulching film laying, field planting, field management and harvesting. By adopting the method, the problem is solved that serious diseases and insect pests occurin a tomato fruiting period in a plum rain season, diseases such as early blight and late blight of tomatoes can be effectively avoided or relieved, pesticide application frequency can be reduced, soil pollution can be reduced, and the working time and cost are saved; by adopting an electric heating hotbed for raising seedlings, the mature period of the tomatoes is more than 15 days ahead, and the early income of the tomatoes is obviously increased; rainproof cultivation can make a harvesting period extend to November, the yield can be greatly increased by 20% compared with that of open fieldcultivation, and the economic benefit is remarkable.