Method for killing oncomelania in wild rotten mud land through water drainage

The invention relates to a method for killing oncomelania in wild rotten mud land through water drainage. The method comprises the steps that the dry season is selected to form criss-crossed ditches in the wild rotten mud land, and rotten mud in the ditches accumulates on an earth dam to form covering mud; water in the covering mud and the earth dam are filtered into the ditches. Within 15-20 hours after the ditches are formed, an oncomelania killing chemical is spread onto the surface of the covering mud. The oncomelania killing chemical permeates into the covering mud and the earth dam. Water in the ditches is drained after sedimentation, the water level is reduced, and the water depth of 0.1-0.2 m is kept. After 20-40 days, the covering and the earth dam are dewatered and dried, and thegrowth environment of the oncomelania is damaged. According to the method, by reducing the water level of the wild rotten mud land, the soil of the wild rotten mud land is dewatered, so that mature cercariaeae lose a water e