The invention relates to a water conservancy grid slag scraping rotating type dirt removing machine. The water conservancy grid slag scraping rotating type dirt removing machine comprises a frame body, a grid body, chain wheel assemblies and a plurality of dirt removing tooth rakes. The grid body is composed of a vertical grid strip and a cross beam, and is connected with supporting mounting frames on the two sides of the frame body into a whole. A driving mechanism is arranged on the rear side of the top of the frame body. The chain wheel assemblies are arranged on the supporting mounting frames on the two sides of the frame body. The driving mechanism is in driving connection with the chain wheel assemblies. The plurality of dirt removing tooth rakes are uniformly spaced and connected tothe chain wheel assemblies and are correspondingly matched with the vertical grid strip in the up-down direction of the frame body for dirt raking. Dirt scraping supports are mounted on the supporting mounting frames on the two sides below a frame body rear side driving mechanism. A dirt scraping tooth rake is connected between the two dirt scraping supports. Teeth of the dirt scraping tooth rakecorrespond to tooth gaps of the dirt removing tooth rakes. The water conservancy grid slag scraping rotating type dirt removing machine is simple in structure, and can effectively ensure that dirt does not fall back into a grid back gate, so that the dirt removing performance is improved, and the service life is prolonged.