Abstract: Casing is an important part of aero-engine, there exist burrs in the edge of casing after machining, which will seriously affect the secondary positioning, assembly and manufacturing accuracy. Aiming at the problems of poor stability and over/under polishing of manual deburring in factories, an automatic deburring method of robot polishing using superhard abrasive elastic tools is proposed in this paper. Firstly, the deburring process system of casing edge is built, and then the selection and teaching programming of superhard abrasive polishing tool are realized. Finally, the optimization experiment of polishing process parameters is carried out and verified on a typical aero-engine rear casing. The results show that the edge filter radius is about 0.1 mm, the transition of adjacent areas is smooth, the processing time is about 3 min, and the polishing tool life is acceptable, which provides a feasible method for automatic deburring of casing.