The utility model relates to an annulus hollow drug feeding device of centrifugal bushing which can be delivered and gained under well and is communicated with the oil covers under well, belonging to the field of oil exploitation. The utility model comprises a work cylinder(1), a retrievable valve spool assembly, and an O-shaped airproof ring(3). The inside of the work cylinder(1) can be provided with the retrievable valve spool assembly(2), the O-shaped airproof ring(3) is arranged between the work cylinder(1) and the retrievable valve spool assembly(2), thereby not only not influencing the testing of the oil well, but also not needing the well repairing works after the devices under well are abated; and the utility model can require the different craftwork requirements of the drug adding, blocking oil cover ring hollow and the oil cover communication under the well based on the different craftwork requirements.