Cleaning device for cleaning lathe spindle

A cleaning device for cleaning a lathe spindle comprises a barrel and a cover, an upper mounting seat is arranged at the bottom end of the cover, a lower mounting seat is arranged on the inner bottom wall of the barrel, a cleaning plate and a driving structure for driving the cleaning plate to move up and down are slidably connected into the barrel, and a mounting hole is formed in the center of the cleaning plate. An annular cleaning sponge is detachably connected into the mounting hole, a plurality of first connecting holes are longitudinally formed in the annular cleaning sponge in a penetrating mode, an annular upper clamping plate is detachably connected to the top end of the cleaning plate through fastening bolts, and the inner side of the annular upper clamping plate extends to the position above the mounting hole and is provided with a plurality of second connecting holes; an annular lower clamping plate is fixed to the bottom end of the inner side wall of the mounting hole, a plurality of first threa