The invention provides a product positioning mechanism and an abrasive blasting mechanism. The positioning mechanism comprises a round base, a fixing plate and a bearing, wherein the fixing plate andthe bearing are arranged on the upper side and the lower side of the base correspondingly; the fixing plate rotates around the bearing; a detachable baffle is arranged in the center of the fixing plate; product limiting platforms and limiting cover plates covering the product limiting platforms are evenly distributed on the fixing plate; a product limiting groove matched with a product to be positioned in structure is formed between every two adjoining product limiting platforms; and the products to be positioned are arranged in the product limiting grooves and limited with the assistance of the limiting cover plates and the baffle. Through the product positioning mechanism and the abrasive blasting mechanism, the multiple products can be positioned at the same time, one-time uniform abrasive blasting operation of the products is realized, and the risk of sand accumulation is reduced.