Alumina matrix polishing solution as well as preparation method and application thereof

The invention discloses an aluminum oxide matrix polishing solution and a preparation method and application thereof. The preparation method includes the steps that 1, pseudo-boehmite and boric acid are evenly mixed to prepare a mixture, then the mixture is compacted to reduce the distance between particles, then calcination and smashing are conducted till D50 is 20-25 microns, and wet grinding is adopted till the particle granularity D50 is 2.0-2.5 microns and D100 is smaller than 15 microns; and (2) the ball-milled slurry obtained in the step (1), silica sol, a suspending agent and a defoaming agent are mixed to prepare the aluminum oxide matrix polishing solution. The invention discloses application of the prepared alumina matrix polishing solution in polishing CR39 lenses and PC lenses. The alumina matrix polishing solution prepared by the method has excellent polishing efficiency in the polishing process of CR39 lenses and PC lenses, is low in scratch or even does not scratch, and is simple in process an