A collective LED intelligent illumination control device includes a power converter for providing the necessary working power supply to a plurality of LED lamps, and a multipurpose controller for dimming control of each said LED lamp which includes a power measurement module for measuring the power consumed by each LED lamp and recording the measured data, a scene mode input interface in conjunction with at least one existing wall switch for group switching and multi-step dimming controls, and a built-in network card and a Zigbee communication interface for communication with a remote server for remote power and dimming controls and collection of power consumption data of each said LED lamp and for wireless communication with surrounding sensors and equipment for predetermined data collection and controls.