The invention relates to a rotor structure of a switched reluctance motor. The rotor structure comprises an armature shaft and a rotor core, wherein the rotor core sleeves the armature shaft, the rotor core is provided with a plurality of salient poles, a salient pole gap is formed between two adjacent salient poles, a groove is formed in a surface of each salient pole, at least one end of the groove communicates with the salient pole gap, the rotor structure also comprises a rounding part, the rounding part is matched with the rotor core, so that the rounding element and the rotor core are jointly in a cylindrical structure. The rotor structure is simple, the rotor core is segmented by the grooves, a connection part, between adjacent salient poles, of the rounding part can be increased, the integrity and the strength of the rounding part are improved, so that the wind abrasion of a rotor can be effectively reduced, the noise is reduced, and the motor efficiency is improved; and moreover, a phenomenon that a weak part where the rounding part and the rotor core are connected is stripped during high-speed rotation of the rotor structure can be effectively prevented, and the strength of the rotor structure is further improved.