The invention discloses a light fixture control device having a communication function and a control method thereof. The control device comprises an LED light fixture local area network constituted by a plurality of nodes, and each of the nodes comprises an LED light fixture, an LED power supply, and a CPU. The CPU is connected with a motion detector and a local area network interface module, and the nodes can be communicated with each other, and can be communicated with a central controller. The central controller can be communicated with a control terminal, and the autonomous control of the nodes of the LED light fixture local area network can be realized according to the signals of the motion detector, and then the centralized control can be realized according to the signals of the central controller, and the remote control can be realized according to the signals of the control terminal, and therefore the intelligent switching-on, the intelligent switching-off, the access to the highlight illuminating working mode, and the access to the energy-saving working mode of the LED light fixture can be realized, the illumination requirements of the outdoor people and/or high-speed moving objects can be satisfied, the energy consumption can be reduced greatly, and the structure is simple, reasonable, environmental-friendly, and energy-saving.