The invention discloses an electric transmission line pole reliability analysis-based grid risk assessment method. The electric transmission line pole reliability analysis-based grid risk assessment method comprises, step one, collecting design data of electric transmission poles inside a grid; step two, computing the mean value mu R the mean variance sigma R of the pole component resistance R, the mean value mu SG and the mean variance sigma SG of the permanent load effect SG, the mean value mu SQ and the mean variance sigma SQ of the variable load effect SQ of every basic pole component inside the power transmission grid; step three, according to computing results of the step two, computing the reliability beta of every basic power transmission pole in the grid through a JC method; stepfour, computing the failure probability of every basic power transmission pole in the grid; step five, computing the weight factor w of every basic power transmission pole in the grid through an entropy weight method; step six, computing power transmission grid risk P. The electric transmission line pole reliability analysis-based grid risk assessment method solves the problems of high subjectivity and lack of quantitative risk analysis in two-dimensional risk matrixes in the prior art.