The invention discloses a ball valve with a novel sight glass. The ball valve comprises a valve rod, a valve rod frame and a valve body. The valve body is provided with the valve rod frame. The bottom of the valve rod penetrates the valve rod frame and is installed on the top of a valve ball. Two dredging frames are arranged at the outer portion of the valve rod frame. The bottoms of the two dredging frames are arranged on the valve body, and the two dredging frames are located on the left side and the right side of the valve ball correspondingly and provided with dredging holes correspondingly. The sight glass is installed on the top of a water inlet pipe of the valve body, and a rotation wheel is installed in the sight glass. According to the technical purpose, the ball valve with the novel sight glass is provided, the ball valve has rapid dredging capability and prevents blockage, and by means of the ball valve with the novel sight glass, flowing of media can be accurately known in the turbid media.