A three-wire LED addressable online, comprising a three-wire conductor and a plurality of LED light bodies conductively connected via the three-wire conductor, wherein the three-wire conductor comprises a positive electrode conductor, a negative electrode conductor, and signal wires, wherein the signal wire in any one of the LED light bodies is disconnected, connection breakpoints of two signal wires in the LED light body are respectively a signal input terminal and a signal output terminal, a control chip and an LED light-emitting chip are disposed in the LED light body, and the signal input terminal and the signal output terminal are both connected to the control chip,
- wherein when each of the LED light bodies is operated in a signal transmission state, each of the LED light bodies is configured to perform internal signal retrieval, reading, shaping, amplification, and forwarding, and
- when each of the LED light bodies is operated in an address code burning state, each of the LED light bodies is configured to be in a locatable state to set an address code.