The present disclosure provides an AC power adapter comprising input connectors, first power conveying wires, a junction box, a power conveying wire assembly and a plug. The first power conveying wire is coupled to the input connector and includes an input neutral wire, an input live wire and an input ground wire. The power conveying wire assembly is electrically connected to the first power conveying wire through the junction box and includes plural output neutral wires, plural output live wires and an output ground wire. The output neutral wires are coupled to the input neutral wires respectively, the output live wires are coupled to the input live wires respectively, and the output ground wire is coupled to the input ground wires. The plug includes a housing and an electrical connector. The power conveying wire assembly is inserted into the housing and connected with the electrical connector.