According to the present invention, an outdoor LED display device which can be quickly coupled outdoors to be used. The outdoor LED display device comprises: an LED display module; a fixing module attached to a back surface of the LED display module; and an installation frame consisting of a plurality of standing bars extending in a height direction and a plurality of connection bars crossing the plurality of standing bars to connect the standing bars and having an insertion protrusion coupled to the fixing module so that the LED display module can be mounted at intersections of the standing bars and the connection bars while the LED display module is stood.
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