In this paper，the analytic hierarchy process（AHP） is used to analyse the influencing factors of power cable fire risk from four aspects： power cable operation parameters，cable fire safety，cable type and cable laying. Moreover，the evaluation set of power cable fire risk early warning signals is put forward，and the power cable fire risk assessment model is established. The results show that the early warning signal obtained by the power cable fire risk assessment model could scientifically and accurately reflect the fire early warning state of the power cable and provide guidance for the operation and maintenance of the power cable.