Steel ball throwing device

A steel ball throwing device comprises a steel ball throwing bin, a pre-storage plate, a throwing plate, a sliding support, a test tube rack, a support plate and a bottom plate, the steel ball throwing bin comprises a top plate, a side wall and a conveying plate, the conveying plate is provided with a plurality of funnel-shaped through holes, and the pre-storage plate and the throwing plate are both provided with steel ball through holes corresponding to the funnel-shaped through holes of the conveying plate. The sliding rods are arranged on the two sides of the pre-storage plate, the two support plates are fixed to the two sides of the bottom plate respectively to form a U-shaped structure, the steel ball throwing bin is fixed between the two support plates, the pre-storage plate is fixedly connected with the sliding support, the throwing plate is connected with the sliding support in a sliding mode, and the steel ball throwing bin is connected with the pre-storage plate. And meanwhile, the steel ball throwi