Lubricating oil purification cycle device

The invention discloses a lubricating oil purification cycle device. The lubricating oil purification cycle device comprises a pre-heating chamber, a filtering chamber, a centrifugal machine, a carbon fiber filter and an oil purification chamber which are connected in sequence; an oil inlet is formed in the side wall of the pre-heating chamber, the filtering chamber comprises an activated carbon filtering layer arranged on the bottom and an overflow opening formed in the side wall, the activated carbon filtering layer is connected with the pre-heating chamber and the filtering chamber, and the overflow opening is connected with the centrifugal machine through a pipe; and a vacuum evacuating device is further connected to the centrifugal machine, and electric heating devices are arranged in the pre-heating chamber and the centrifugal machine. According to the lubricating oil purification cycle device, the pre-heating chamber is arranged below the filtering chamber, impurities existing in waste lubricating oil