Screen panel mounting structure and screen

The utility model relates to the technical field of screens, in particular to a screen panel mounting structure which comprises four frames, the four frames are sequentially connected end to end to form a rectangular frame, a corner connector assembly comprises two corner connectors and locking screws, and the two corner connectors are both in an L shape to form two perpendicular connecting parts. One corner brace is an inner corner brace, the other corner brace is an outer corner brace, screw holes are formed in two connecting parts of the inner corner brace, through holes are formed in two connecting parts of the outer corner brace, butt joint parts are arranged at the two ends of the frame, the two connecting parts of the inner corner brace are located on the inner sides of the butt joint parts respectively, and the two connecting parts of the outer corner brace are located on the outer sides of the butt joint parts respectively. The locking screw penetrates through the through hole and is in threaded conn