The invention discloses a gate device of an eddy-vibrating screen discharge port. The gate device of the eddy-vibrating screen discharge port comprises a screen frame and a discharge opening installed on the side wall of the screen frame. The inner side wall of the screen frame, opposite to the discharge opening, is provided with a rail baffle extended to one side. The part, opposite to the discharge opening, on the rail baffle is provided with a gap. The inner side of the rail baffle is slidingly matched with a gate plate matched with the discharge opening. One side of the gate plate is connected with one end of a screw rod. The screw rod is slidingly matched with a horizontal sliding chute installed on the side wall of the screen frame. The other end of the screw rod is screwed with a regulating handle. The rail baffle, adjacent to the discharge opening, of one side of the horizontal sliding chute is internally provided with a sealing strip having the same height as the rail baffle. The gate device of the eddy-vibrating screen discharge port is capable of effectively reducing the loss of an easily damaged screen net, saving labor and time, improving the production efficiency, reducing the machining cost, avoiding the friction damage caused by the lower edge of the gate and the screen net in the processes of the open and close of the gate and the screening process.