The present invention relates to a device for detaching and attaching an LED display device. More specifically, for solving the problems of existing LED display device techniques such as the instability of power supply to an LED device, the external exposure of a light emitting source, and the coupling having a soft spot for shock and vibration, the power supply to an LED display device is smooth by coupling the LED display device to a backplane substrate, the robust coupling between a plurality of LED display device is possible by inserting the LED display devices into slots of the backplane substrate to couple the LED display devices, safely fix the LED display device to a display window through a case for supporting the LED display device, and implement an LED display window resistant to the shock and vibration by coupling the LED display device to a bezel to fit and couple the LED display device to the case.;COPYRIGHT KIPO 2020
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