The invention discloses a printing ink circulation device. The printing ink circulation device comprises a main ink box. The main ink box comprises an ink box body, an ink box inner container and an ink box cover plate covering the ink box inner container in a sealing manner. The ink box cover plate is connected with a backflow connector connected with a liquid conveying mechanism. The ink box cover plate is provided with a rotation shaft through hole and further connected with a stirring mechanism. The stirring mechanism comprises a stirring bar and a direct current motor. The stirring bar isconnected with a coupler connected with the direct current motor. The liquid conveying mechanism can conduct flow guiding on ink or waste ink flowing back from a printing sprayer into the ink box inner container through the backflow connector, the ink can be prevented from being deposited and caked in the sprayer or an ink supply pipeline, and normal running of a printer is guaranteed. The main ink box is of a seal structure, the stirring mechanism arranged in the main ink box utilizes the outer direct current motor for providing power for the inner stirring bar, the ink in the ink box innercontainer is stirred, the ink is in a non-static state, the phenomenon of standing separation of the printing ink is prevented, and the printing quality of the printer is improved.