A jumper wire is fixed on a groove of a jumper wire holder when the first end of the jumper wire passes through a first holding hole of the jumper wire holder and the second end passes through a second holding hole of the jumper wire holder. The two positioning pins at the ends of the jumper wire holder allow the jumper wire holder for being easily installed on the PCB. The reflowing welding is available to weld the jumper wire on the jumper wire holder with the circuit on the PCB. The connectors at the ends of the jumper wire holder allow the jumper wire holder to combine in series, providing the jumper wire holder for holding longer jumper wire.