Leguminous crop and potato rotation planting method

The invention provides a crop rotation planting method for leguminous crops and potatoes. The crop rotation planting method comprises the following steps that straw powder is prepared from leguminous crop straw; the field parcels where the leguminous crops are harvested are fertilized, the applied fertilizer at least comprises hymexazol and trichoderma harzianum, and the mass ratio of hymexazol to trichoderma harzianum is 1: 3-5: 1; selecting detoxified potatoes as seed potatoes, and exposing terminal buds of seed potato blocks after dicing; adopting a bactericide to stir the seed potato blocks; a plurality of rows of seed potato blocks are sown in sequence, the surfaces of the seed potato blocks are covered with straw powder, and film covering is conducted after straw powder covering; after the potatoes grow to be mature, ploughing and impurity removal are conducted on the field again, and leguminous crops continue to be sown. According to the crop rotation planting method for the leguminous crops and the po