The invention discloses a waterpower treatment device for treatment of the non-smoothed surface of a semi-rigid base. The waterpower treatment device comprises a carrying vehicle. A rack is arranged on the carrying vehicle; a gas conveying mechanism, a water flow conveying mechanism and a sprinkling mechanism are arranged on the rack; the gas conveying mechanism and the water flow conveying mechanism are connected with the sprinkling mechanism for sprinkling; a speed changing box of the carrying vehicle is connected with a power takeoff; and the power takeoff is connected with the gas conveying mechanism and the water flow conveying mechanism through a belt pair for power providing. The roughness of the semi-rigid base is enlarged, frictional force and bonding strength between the semi-rigid base and an asphalt surface layer are improved, accordingly the overall quality of a road can be improved, and the service life of the road is prolonged.