Disclosed is a cultivation method of pea crab seeds in the paddy field. The cultivation method includes the steps of 1), preparation of a cultivation pond, namely digging an annular trench and a diversion trench, preparing inlet and drainage facilities, performing disinfecting with quicklime, cultivating water quality and planting water peanuts; 2), raising of the pea crab seeds, namely at the beginning of May, raising young crabs with large eyes in the pond at the ratio of 2kg / mu; 3), fodder feeding, namely after 10 days of raising the large-eye larvae in the paddy field, performing fodder feeding at a fixed position and time every day, wherein fodder of the large-eye larvae is mainly based on free feeding of aquatic plants; 4), control of water quality and sediment, namely applying photosynthetic bacteria and nitrifying bacteria to maintain dissolved oxygen content in water and changing water once every 5 days from May to March of the next year; 5), harvest of the pea crabs, namely performing fishing in December of the year and January to March of the following year. In the method that the pea crabs are cultivated under paddy field conditions, the yield of 150g per mu of the peacrabs can be realized, the pea crabs are strong in growth and good in the immunity and adaptability, and the yield of the pea crabs per unit water body can be effectively increased.