The invention discloses a planting method for spring sowing of mid-ripening cowpea varieties in the open field, which comprises soil disinfection, fertilization for site preparation, ridge farming, plastic film covering, seed treatment, seedling cultivation in nutrient pots, transplanting seedlings at the right time, seedling transplanting methods, reasonable and thin planting, and post-transplanting Surround the cowpea field with nylon nets and remove the nylon nets after the seedlings are established. The seed treatment of the present invention shortens the germination time of seeds, improves the germination rate, and ensures that all seedlings are sown at one time; ridge cultivation can adjust water, heat, and air conditions, reduce waterlogging damage, and reduce pests and diseases; plastic film mulching can improve drought resistance, moisture conservation, rain prevention, and drainage effects , and save the cost of weeding; transplant seedlings properly, avoid the low temperature in spring, improve the robustness of cowpea seedlings, and increase the yield of cowpea; isolation with nylon nets prevents bird damage and small animals from eating cowpea seedlings, and saves the cost of supplementing seedlings. The present invention is suitable as a planting method for spring sowing cowpea in the middle and lower reaches of the Yangtze River, and is readily accepted by bases, planters or scientific research units, and has excellent prospects for popularization and application.