Disinfecting and sterilizing method for red swamp crayfish ditches for culture of red swamp crayfish in paddy field

The invention relates to a disinfecting and sterilizing method for red swamp crayfish ditches for culture of red swamp crayfish in a paddy field. The method comprises the following steps: step 1, performing previous preparation: after rice is harvested, digging the red swamp crayfish ditches around the paddy field, and performing natural drying for 10-15 days; step 2, performing dry sterilization:uniformly spraying mixed powder of quicklime and potassium permanganate to the upper surfaces of the paddy field and the red swamp crayfish ditches, wherein the thickness of the mixed powder of the quicklime and the potassium permanganate is 2-4 mm, and performing airing for 3-5 days; and step 3, filling the paddy field and the red swamp crayfish ditches with fresh water: performing irrigation inthe paddy field and the red swamp crayfish ditches by utilizing a water pump or other water supply device, and when irrigation is performed, mixing a mixed pesticide in the fresh water. The method provided by the invention ov