The present invention relates to a freely-assembled flat-panel LED lighting device, which comprises a plurality of LED modules, each of which includes a plurality of light emitting diode (LED) devices integrated on a PCB substrate to emit light when power is supplied thereto, A mounting substrate disposed under the LED module and electrically connected to the LED module; a mounting / demounting unit for easily detachably mounting the LED module on the mounting substrate; And a transparent panel disposed on the upper surface of the flat plate case to protect the LED module. The LED module has a structure in which the LED module can be installed on the mounting board through a magnetic force very easily and can be supplied with power through the mounting / demounting means, so that a normal user can easily replace the LED module The use of the luminaire is very convenient and the user can easily and freely change the light emitting mode of the luminaire according to his / her preference through the easy attachment / detachment of the LED module through the attaching / detaching means, . In addition, since the LED module floats above the mounting substrate, the heat emitted from the LED module can be easily exchanged with the surrounding air, and the heat can be released by the natural air cooling method. There is an effect that it is possible to stably prevent the problem of failure or failure.
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