An automatic process for the identification and working of defects (12) on used tires (6) is disclosed, comprising the steps of assembling the used tire (6) on rotative support and centring means (7), starting the rotation of the tire (6), automatic scanning of the working surface (30) of the tire (6) to identify the morphology of defects (12) by means of automatic identification means (8, 41) of defects (12), comparison between the morphology of the defect (12) identified and a virtual library of defects (12′) of reference for the selection of the working and of the tool (9) to be used, charging the tool (9) chosen on an anthropomorphic robot (31), and executing the selected working on the defect (12) to form a crater (13) that is suitable for being coated, said steps being managed by a computerized control unit (11) comprising said virtual library of defects (12′).