An LED display device, comprising: an LED display panel (1); and a mask arranged on one side of the LED display panel (1). The mask comprises a plurality of light-transmitting mask units (10), wherein each light-transmitting mask unit (10) is bonded to the LED display panel (1), and positioning structures are arranged between the light-transmitting mask units (10) and the LED display panel (1) so as to limit the bonding location of each light-transmitting mask unit (10) on the LED display panel (1). The LED display device has the advantages of a small splicing gap and a good display effect.
