The invention relates to an arc edge automatic grinding mechanism used for electronic products. The mechanism comprises a rack, an electric control device is arranged on the lower portion of the rack,a loading conveying belt, a first grinding device, a second grinding device and a discharging conveying belt are arranged on the upper portion of the rack and are sequentially arranged from left to right, the first grinding device comprises a first product jig rotating assembly, a first X-direction sliding table assembly and a first forward moving rotating grinding device, and the first forward moving rotating grinding device comprises a first grinding assembly, a first lifting assembly, a first rotating assembly, a first forward moving assembly and a first supporting frame which are sequentially arranged from top to bottom. Through the forward moving assembly, the grinding assembly moves to be close to the products on the jig component, through cooperation of the rotating assembly and the lifting assembly, the grinding assembly can turn over, ascend and descend so as to facilitate accurate and continuous grinding of the arc side of the outer edge of the product, all components of thegrinding device are arranged in a concentrated manner, the work flow is shortened and simplified, manual cost input is reduced, grinding quality precision is improved, and the electronic product arcside grinding efficiency is improved.