The patent abstract shows that the present invention relates to the field of LED display technology and provides a corner protection device and an LED display screen. The corner protection device includes: a fixed base, which is detachably connected to the LED display screen; and a protective piece, which is rotatably connected to the fixed base. The size of the protective piece matches the size of the LED display screen. The protective piece has a protective state and a splicing state, and the protective piece rotates along the fixed base. When moving to the protection state, the protection piece is close to and surrounding the corners of the LED display. When the protection piece rotates along the fixing base to the splicing state, the protection piece is away from the corners of the LED display; the linkage component is movably connected to the fixing base, and the linkage component is used to lock the protection piece when it rotates to the splicing state, or to release the protection piece in the splicing state, so that the protection piece rotates from the splicing state to the protection state. This application can quickly lock the protective piece without affecting the splicing of the display screen, or quickly release the protective piece to protect the corners of the display screen.
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