The invention discloses a one-way burr polishing device for a screen. The one-way burr polishing device for the screen comprises a base, a workbench, a positioning rod, a limiting plate and a polishing device, wherein the workbench is arranged on the base; a through hole matched with one of meshes of the screen is formed in the workbench; the polishing device comprises a slide way and a polishing block; the head and tail ends of the slide way are connected; the polishing block slides along the slide way; the slide way comprises a straight section, an arc-shaped section and a curved section which are connected in sequence; the arc-shaped section and the curved section are positioned above the straight section respectively; the positioning rod is cylindrical; the diameter of the positioning rod is equal to that of the through hole; one end of the positioning rod is connected to the interior of the through hole, and the other end of the positioning rod is connected to the curved section of the slide way; the straight section of the slide way is close to the workbench; when the polishing block is positioned on the straight section, the lowermost part of the polishing block is flush with the top of an ejector rod, and the limiting plate can slide along the workbench. According to the one-way burr polishing device for the screen, large-area polishing can be achieved by virtue of the sliding of the polishing block, so that the time is saved, and the efficiency is improved. The polishing block can move along a plane, burrs on the plane can be polished away, and the polishing effect is better.