The utility model provides a sealing ring which comprises a ring body, the ring body comprises an annular groove, the upper surface and the lower surface of the bottom wall of the annular groove are respectively provided with a first protruding ring, and the first protruding rings are closed rings with the same extending direction as the annular groove. According to the sealing ring, the side wallof the annular groove has the function of reducing water impact force, the pressure between the first protruding ring and the sealed body is increased, and the sealing performance of the first protruding ring is improved. The utility model further provides an LED display screen which comprises a module, a box body, a power supply box and a plurality of sealing rings in the technical scheme, the sealing ring arranged between the power supply box and the box body is a first sealing rubber ring, and the sealing ring arranged between the box body and the module is a second sealing rubber ring. According to the LED display screen, the sealing performance of the first sealing rubber ring and the second sealing rubber ring is good, and the sealing performance of the LED display screen is improved.