Combined grinding and milling device capable of preventing sleeve from being abraded and windowing

The utility model relates to the technical field of oil field downhole tools, in particular to a casing abrasion and windowing prevention combined type milling device which comprises an abrasion prevention centralizing device, a safety connector and an eccentric abrasion prevention type milling tool. The lower end of the abrasion prevention centralizing device is fixedly connected with the eccentric abrasion prevention type milling tool through the safety connector. And a centralizer upper thread which can be connected with a drill rod is arranged at the upper end of the anti-abrasion centralizing device. The drilling tool is reasonable and compact in structure and convenient to use, the sliding friction force generated when the drilling tool is lifted up and down in a borehole can be reduced through the anti-abrasion centralizing device, the rotating resistance is reduced, the drilling direction is controlled, the deviation is effectively corrected, meanwhile, burrs, scales and residual sundries on a sleeve