Method and device for identifying abnormal SIM (Subscriber Identity Module) card

The invention relates to a method and device for identifying an abnormal SIM card, and the method comprises the steps: constructing and training an SIM card classification model through employing a decision tree based on the obtained historical communication performance index data of all user terminals containing the SIM card, thereby obtaining an SIM card classification model which accords with an expected effect, and improving the classification efficiency of the SIM card. And inputting the current communication performance index data into the SIM card classification model for anomaly detection, and outputting an anomaly result. Therefore, whether the SIM card is abnormal or not is detected according to the communication performance index data, and hidden factors influencing the abnormity of the SIM card can be checked, so that the phenomenon of missed judgment is avoided, the accuracy of the abnormity detection of the SIM card is improved, a customer can be reminded to replace the SIM card in time, the com