The invention discloses a generalized displacement strain monitoring progressive identification method for a defective cable and concentrated loads. On the basis of strain monitoring, whether a mechanical calculation reference model of a cable structure needs to be updated or not is determined by monitoring generalized displacement of a supporting seat, temperature of the cable structure and environment temperature, a mechanical calculation reference model of the cable structure taking the generalized displacement of the supporting seat, the temperature of the cable structure and the environment temperature into consideration is obtained, and on the basis of the model, a numerical value changing matrix of unit damage monitored quantities is obtained through calculation. According to the approximate linear relation between current numeric vectors of monitored quantities, current initial numeric vectors of the monitored quantities, the numerical value changing matrix of the unit damage monitored quantities, and current nominal damage vectors of evaluated objects to be solved, the non-inferior solution of the current nominal damage vectors of the evaluated objects to be solved is calculated, accordingly, influences of interference factors can be eliminated when the generalized displacement of the supporting seat exists and the temperature changes, and variable quantities of the concentrated loads and the defective cable can be identified.