The invention discloses an electrolysis device for preparing high purity titanium and belongs to the field of preparation of titanium. The electrolysis device realizes recycling of an electrolyte solution and saves a production cost. The electrolysis device comprises an electrolysis reactor, and a cathode plate and a titanium-coated anode plate in the electrolysis reactor. An electrolyte solutionfeeding pipe communicated with the electrolysis reactor cavity is arranged outside the electrolysis reactor. A diversion pipe below the titanium-coated anode plate is arranged in the electrolysis reactor. One end of the diversion pipe extends into the electrolysis reactor and is provided with an anode liquid outlet. The titanium-coated anode plate is sleeved by an anode diaphragm bag communicatedwith the diversion pipe. The electrolysis device also comprises an extraction tank and an oil removal device. A liquid inlet of the extraction tank is communicated with an anode liquid outlet of the diversion pipe. A liquid outlet of the extraction tank is communicated with the electrolyte solution feeding pipe through the oil removal device. The electrolysis device realizes recovery and recyclingof an electrolyte, keeps the electrolyte solution stability, prevents electrolyte solution ingredient change and improves the quality of a high-purity titanium product in follow-on production.