The invention relates to the technical field of polishing auxiliary equipment, in particular to an unloading device and chemical and mechanical polishing auxiliary equipment. The unloading device comprises a polishing disc, a spraying mechanism, a recovery mechanism, a conveying mechanism and an unloading mechanism. The spraying mechanism comprises a spraying tank and multiple sets of sprayers. The recovery mechanism comprises a recovery piece box. The conveying mechanism comprises a conveying belt. The unloading mechanism comprises an unloading table and a high-pressure water sprayer. According to the unloading device, the polishing disc is put on the conveying belt in the spraying tank, when the polishing disc can be conveyed to an unloading opening through the conveying belt, the sprayers spray protection liquid onto the polishing disc, when the polishing disc is conveyed to the position of the unloading opening through the conveying belt, the unloading table moves upwards to jack the polishing disc and enable the polishing disc to be separated from the conveying belt, the polishing disc is opposite to an opening of the recovery piece box, a product on the polishing disc is sprayed into the recovery piece box through the high-pressure water sprayer, the product on the polishing disc is always in a wet state in the unloading process, and following washing operation of the product is facilitated.