Precision hole and precision face protection method in aluminum and aluminum alloy anodic oxidation process

The invention provides a precision hole and precision face protection method in an aluminum and aluminum alloy anodic oxidation process. Methyl red is poured into a beaker, acetone with one half sizeis slowly poured into the beaker to be slowly stirred, the methyl red is dissolved in the acetone, the surface of a part to be protected is evenly coated with three or more layers of prepared mixed liquid through a soft brush or ink brush, after each layer is coated, the layer is naturally dried in a dustproof sterile environment, the part subject to coating is placed in the environment with the light intensity strength larger than or equal to 70 LX, and whether the red rubber coating layer is continuous and uniform or not is visually checked; a blunt hard object is used for touching a protection coating with force, and deforming is not generated; the part subject to rubber coating is immersed in acetone, and after the protection coating is dissolved, the part is taken out and is washed tobe clean through acetone