The invention relates to the technical field of oil purification equipment, in particular to a centrifugal oil purifying machine. The centrifugal oil purifying machine is provided with a central shaft, a centrifugal cylinder, a front end cover, a rotating framework, a disk type guide plate, an oil collecting impeller, a driving device, an oil outlet pipe, an oil inlet pipe and an oil tank, and is characterized in that the disk type guide plate is made of titanium alloy material, involute-shaped convex edges are radially uniformly distributed on the surface of the disk type guide plate, oil-blocking convex edges are arranged between the involute-shaped convex edges, the oil-blocking convex edges are in ladder-like distribution, at least two drainage holes are arranged in the positions with large diameter below a cylinder body of the centrifugal cylinder in the centrifugal oil purifying machine, a water storage cavity is arranged above the cylinder body of the centrifugal cylinder, a drainage channel is arranged in the wall of the centrifugal cylinder, the drainage holes are communicated with the water storage cavity via the drainage channel, the water storage cavity is communicated with a water outlet guide pipe, and water sealing devices are arranged in the drainage holes. Due to the adoption of the structure, the centrifugal oil purifying machine has the advantages of novel structure, strong pollution discharge capability, safety in operation, stable performances, long service life of oil, no operation cost, no consumption of filter material, obvious separation effect and the like.