The utility model discloses a channel grinding type bar screen. The bar screen comprises a channel type bar screen framework. An arc-shaped overflow bar screen provided with at least one overflow groove is arranged in the bar screen framework. One end of the arc-shaped overflow bar screen is fixed at the water inlet end of the bar screen framework, the other end is fixed at the water outlet end of the bar screen framework, and the raised arc surface is directed to the water inlet end of the bar screen framework. A rotating scraper capable of being engaged with the overflow groove during the rotating is arranged in the bar screen framework at the water outlet end of the overflow bar screen, and the water outlet end of the bar screen framework is provided with a grinder. The adoption of the fixed type arc-shaped overflow bar screen largely increases bar screen rigidity, effectively resists current impact and increases the quantity of sewage passing through. Meanwhile, the rotating scraper is precisely engaged with the bar screen, solid impurities trapped on the upstream surface of the fixed bar screen can be cleared, and the solid impurities trapped are ground by the grinder to pass through.