The invention discloses a production method of a titanium three-way tube which is applied to the water conveying environment. The production method comprises the steps of billet tube manufacturing, cold expanding forming, hole punching, second time of forming, shaping, side pipe connecting and connector installing. The titanium three-way tube comprises a main tube, a branch tube is installed on the main pipe, a side tube is welded to an opening of the branch tube, a tube connector is installed at the tube end of the side tube. The titanium three-way tube is a thin-walled three-way tube made through cold machining forming of a pure-titanium tube, all aspects of excellent performance of corrosion resistance, low density, high specific strength and the like of titanium materials is kept, the technical problem that a welding joint cannot be arranged in a liquid junction is solved, connection through a non-three-way mode such as welding through flange discs is avoided, titanium flange type connectors are arranged at the tube ends, direct connection of a water conveying pipeline is achieved, liquid conveying resistance is small, the occupied space is small, the overall weight is small, water conveying efficiency is high, installing is efficient, fast and convenient, maintaining is convenient, cost is low, and the titanium three-way tube can be widely applied to the water conveying environment.