The utility model discloses a WSN-based facility agriculture dimming system, comprising a main control node, driving nodes and LED actuators, wherein the main control node takes a first processor as the core, the processor receives environmental information acquired by a data acquisition module, and performs wireless transmission through a connected first wireless transceiver module; the driving nodes take second processors as the cores, the second processors receive dimming data transmitted by the main control node through connected second wireless transceiver modules, and each second processor is connected with a first relay and a second relay; each LED actuator comprises a red-light LED lamp group and a blue-light LED lamp group, the first relays are connected with the red-light LED lamp groups through red-light driving modules, and the second relays are connected with the blue-light LED lamp groups through blue-light driving modules; and the driving nodes are connected with the plurality of LED actuators, and a wireless sensor network is established by the main control node. The WSN-based facility agriculture dimming system satisfies the actual production demands of facility agriculture, has high reliability, can realize various control modes, further improves the economic benefit of greenhouse crops, and improves the agricultural production management level.