The invention relates to a display terminal, a display screen thereof and a display screen grinding tool, wherein the display screen comprises a display surface and a back surface which are opposite to each other, a mounting groove is formed penetrating through the display surface and the back surface, and the mounting groove extends to one side edge of the display screen. The side wall of the mounting groove is an outwards-convex arc surface, and reinforcing ribs are arranged on the arc surface. The extending direction of the central axis of the reinforcing ribs is consistent with the extending direction of the central axis of the arc surface. According to the display screen, the side wall of the mounting groove is arranged as the arc surface, and the reinforcing ribs are arranged on thearc surface. The arc surface can effectively reduce stress concentration, and when the display screen is subjected to bending or extrusion stress, the arc surface can distribute stress, and the reinforcing ribs can increase the stress capability of the side wall of the display screen mounting groove, so that the strength of the display screen is integrally improved. Meanwhile, the extending direction of the central axis of the reinforcing ribs is consistent with the extending direction of the central axis of the arc surface, so that when the display screen is subjected to grinding processing,the reinforcing ribs and the arc surface can be integrally formed, so that the processing efficiency is improved.