Combined joint device with RJ45 plugs and DB9 male plug

A combined joint device with RJ45 plugs and a DB9 male plug device relates to the field of computer connector. The combined joint device comprises three RJ45 plugs, one DB9 male plug and a twisted-pair wire. The twisted-pair wire comprises eight core wires; one end of each core wire of four core wires in the twisted-pair wire is jointly connected with a first RJ45 plug, and the other end of each core wire of the four core wires is jointly connected with a second RJ45 plug; and one end of each core wire of any three core wires of the other four core wires in the twisted-pair wire is jointly connected to the DB9 male plug, and the other end of each core wire of the three core wires is jointly connected to a third RJ45 plug. According to the combined joint device of the utility model, core wires in each twisted-pair wire is fully utilized, thereby improving the utilization rate of the twisted-pair wire; and at the same time, in the case of the existence of more plugs, the combined joint device can reduce connect