The utility model provides a drain cover board of rich irrigated land district gutter, it includes rectangle apron, has seted up the wash port on the rectangle apron, and the bottom surface of rectangle apron be the arched face of indent, and the periphery of the up end wash port lapped at the rectangle is equipped with the chamfering slot of slope to the wash port. The utility model discloses offer the wash port on drainage ditch cover plate, in the side ditch can effectual messenger's rivers be gone into to the wash port, thereby and do not cause rivers to produce the surface gathered water in the highway gathering. It to the chamfering slot of wash port, is favorable to the drainage of ponding to the side ditch to be equipped with the slope in the periphery of the up end wash port of rectangle apron. Set ARC shape to bottom the apron, be favorable to the compressive capacity of reinforcing apron on the one hand, when on the other hand vertically excretes when the water of side ditch, be favorable to increasing discharge area to be favorable to the drainage of water, avoid rivers to emit stream at side ditch cohesion collection, produce the surface gathered water.