Composite wire for manufacturing titanium product through 3D printing and preparation method of composite wire

The invention provides a composite wire for manufacturing a titanium product through 3D printing. The composite wire comprises a base material, thermoplastic polymers and organic pore forming agents, wherein the thermoplastic polymers and the organic pore forming agents are evenly distributed in the base material. In the composite wire, the volume fraction of the base material is 50%-80%, the sum of the volume fraction of the thermoplastic polymers and the volume fraction of the organic pore forming agent is 20%-50%, and the volume ratio of the thermoplastic polymers to the organic pore forming agents is (1-9):1. The base material is titanium or titanium hydride or titanium alloy or titanium hydride alloy. The thermoplastic polymers and the organic pore forming agents can be completely removed from the composite wire after the composite wire is heated, the organic pore forming agents can be completely removed at the temperature of 50-200 DEG C, and the thermoplastic polymers can be completely removed at the t