The power connector includes a plug assembly and a casing with a plug seat. The plug seat is formed with a room. There is a pair of rails in the room. Two electrode pins are separately mounted in the rails with exposed flexible contact portions. The plug assembly is provided with two plug pins and a pair of troughs corresponding to the two rails. Each of the plug pins has a conduction portion protruding from the troughs for making an electric connection with the flexible contact portions.