The utility model relates to an electricity utilization information acquisition technique, and particularly relates to an electricity utilization information acquisition system based on a WSN (wireless sensor network) and light communication. A wireless electricity quantity sensor acquires electricity utilization information of a smart electric meter through optical fibers, and sends the electricity utilization information to a concentrator through the WSN; the concentrator sends the electricity utilization information to a monitoring main station through an optical network; the monitoring main station monitors the smart electric meter in real time according to the electricity utilization information of the smart electric meter. According to the embodiment of the utility model, the system has the advantages of easiness in wiring and rewiring, stable circuit, convenience in moving, running stability and high reliability. A brand new structure is adopted by the electricity utilization information acquisition device based on the WSN and light communication, and the problems of wiring difficulty, high rewiring work amount, high possibility of circuit damage, incapability in moving, running instability and poor reliability of an existing electricity utilization information acquisition network are solved effectively.