Abstract: Disclosed is a three-wire lamp string in the technical field of colored lamps. The three-wire lamp string comprises three wires and a plurality of lamp beads, wherein the lamp beads are fixed to the three wires respectively, at least one chip is arranged in each lamp bead, and the two ends of each chip are connected with any two wires of the three wires. Lamp beads in various colors can be mounted, so that the displaying of colored lamps in various colors is achieved; by arranging the lamp beads in various colors in a crossed mode, the service types of the lamp beads in various colors are greatly broadened, and the displaying effect is good; meanwhile, compared with an existing four-wire lamp string, the three-wire lamp string of the invention is low in production cost, and the circuit failure rate is greatly decreased.