The invention discloses an LED display device, and belongs to the technical field of LED display screens. The LED display device comprises a glass base plate and a plurality of LED display modules, each LED display module is mounted and fixed on the glass base plate provided with a plurality of magnetic adsorption structures in a magnetic adsorption mode, the magnetic adsorption structures comprise first magnetic rings and steel balls, and the steel balls are adsorbed to the centers of the first magnetic rings so that the first magnetic rings can be disposed around the corresponding steel balls. According to the technical scheme, the technical problems that the flatness of an existing LED box body is difficult to improve and cannot meet the needs of the market are effectively solved.