The invention relates to the technical field of production of a data transmission line. A USB wire automatic molding machine, includes a fixture slideway mechanism, a plastic encapsulation mechanism,a finished product unloading mechanism, a mold bar circulation mechanism, a mold bar feeding mechanism and a mold bar; The two ends of the fixture slideway mechanism are respectively connected with the mold strip feeding mechanism and the mold strip circulating mechanism, and the positions of the plastic encapsulating mechanism and the finished product blanking mechanism correspond to the mold strips on the fixture slideway mechanism. The USB wire automatic molding machine has the advantages of recycling fixture using, automatic fixture loading and unloading, automatic injection molding, scrapcutting and finished product unloading, and high processing efficiency.