The invention discloses a titanium alloy production method. The titanium alloy production method comprises following steps: MgCl2 of molten salt containing MgCl2 and LiCl is electrolyzed, and a magnesium metal liquid layer is formed via sedimentation of electrolytic magnesium metal into the molten salt; chlorides of a plurality of metallic elements which are used for forming the target titanium alloy are mixed uniformly according to molar ratio of the metallic elements in the titanium alloy so as to obtain an alloy raw material mixture; the alloy raw material mixture is contacted with the magnesium metal liquid layer so as to realize reduction of the metal chlorides in the alloy raw material mixture by magnesium metal, and obtain the titanium alloy. Electrolysis conditions and adding amount of the alloy raw material mixture are controlled so that magnesium metal consumption rate in reduction reaction is less than or equal to magnesium metal generation rate via electrolysis. The titanium alloy production method is wide in raw material sources, low in cost, and short in process flow; continuous production can be realized; particles of the titanium alloy obtained via the titanium alloy production method are uniform; metal element content is stable; and distribution is uniform.