The invention aims at providing a power information network safety measurement method for solving the problem that safety pre-warning cannot be carried out based on a network safety measurement index in the existing technical scheme. To realize the purpose, the power information network safety measurement method is provided. The power information network safety measurement method comprises the steps of calculating a network safety measurement index H through a calculation model of the network safety measurement index based on an index parameter VK of each safety event Di; comparing the network safety measurement index H with a measurement index threshold value Y; carrying out pre-warning based on the comparison result; adjusting the measurement index threshold value Y automatically based on the comparison result; when a technology develops and the power information network safety level is higher than a certain degree, adjusting the measurement index threshold value Y automatically based on the steps 3 and 4; and when the power information network safety level is lower than a certain degree, adjusting the measurement index threshold value Y automatically based on the steps 3 and 4 so as to enable the measurement index threshold value Y to be adjusted automatically to a reasonable value in the current network safety environment.