This paper proposes secondary device status evaluation comprehensive model based on variable weights matter-element extension aiming at characteristics of the secondary device status evaluation. A secondary device status information classical field is established to get state parameters matrix. At the same time, state parameters’ weights are corrected by using variable weights theory to overcome the subjective factors of traditional method, three kinds of weight determination method are compared, the results indicate that variable weighting method enlarges anomaly index to make evaluation result worse, which is in line with the device management requirements. Finally, closeness degree is also introduced to judge the condition of the secondary device comprehensively. A secondary device in an 220 kV substation is evaluated using this method, the result shows that the device is in the state of attention, tending to a greater degree of abnormal state, which is consistent with actual operation status of the device, verifying the correctness of the method.