The present invention relates to a drainage controller and, more specifically, relates to a drainage controller capable of supporting growth and development of rice； and automatically maintain a water level in a rice field in accordance with a milky ripe stage, a booting stage, a heading stage, and harvest time to maintain and manage water in a rice field. According to the present invention, the drainage controller comprises: a drainage pipe (100)； a sewer pipe (400)； a water leakage and soil discharge prevention plate (200)； and an opening and closing handle (300).본 발명은 배수조절장치에 관한 것으로서, 벼의 생육을 돕고 논물 유지관리를 위하여 유숙기, 수잉기, 출수기, 추수기에 따라 논물 수위 조절을 자동으로 유지하는 배수조절 장치에 관한 것이다.
