The invention discloses an outdoor display screen which comprises a box. An LED module is arranged in the box. The box comprises a framework and a transparent protective device arranged in front of the LED module. The transparent protective device and the framework are assembled in a sealed mode through a sealing ring. The box is filled with liquid silicon oil so that the LED module can be immersed in the liquid silicon oil. On the premise that the display effect is not affected, sealing performance for isolating erosion of outside moisture or other matter is remarkably improved through the outdoor display screen so that the display screen can work normally in the outdoor severe environment, maintenance is convenient, and outdoor use of high-pixel-density display screens is particularly easy.