The invention relates to the technical field of electric engineering and computer processing, and discloses a quick analysis method and system for multiple forest fire fault electric transmission line risk degree stratification so as to quickly and effectively analyze the importance sorting of a power grid electric transmission line under a situation that multiple faults of the electric transmission line is caused by forest fire disasters. By use of the method, according to stochastic pre-analog, a proportional relation of an analog frequency required by each fault and a total analog frequency in practical analog can be estimated, the distribution of each fault set in the practical analog is guaranteed by the estimated proportional relation, then, different fault multiple numbers are subjected to independent stratification analog calculation, and the risk index of each fault can be subjected to astringency verification. When the analog needs to be increased, approaching to the proportional relation of an analog frequency required by each fault and a total analog frequency in practical analog is taken as a distribution target to determine the multiple numbers of a current analog fault set until accuracy requirements are met, and final data reliability is guaranteed.