The invention discloses a grinding pad and a preparation method and application thereof. The grinding pad comprises a grinding layer, a transparent base plate, a first adhesive layer, an elastic layerand a second adhesive layer, wherein the grinding layer, the transparent base plate, the first adhesive layer, the elastic layer and the second adhesive layer are sequentially arranged from top to bottom; and the grinding layer is prepared from a diamond grinding material, a binding agent and an auxiliary material, wherein the auxiliary material contains sodium chloride particle powder. Accordingto the grinding pad and the preparation method and application thereof, a space three-dimensional disordered micropore structure formed by the sodium chloride powder is applied to the grinding pad, so that lubricating liquid more sufficiently permeates into the surface layer of the grinding pad to participate in grinding, a workpiece subjected to precise grinding obtains higher surface quality, and a transient dry grinding condition is avoided; and meanwhile, the particle surface of a resin abrasive curing layer of the grinding pad has great self-sharpening performance and toughness, good self-repairing effects during grinding, efficient and low-cost processing, high process controllability and environmental friendliness can be achieved, and high processing precision and high-quality workpiece surface are guaranteed.