The invention provides a method and device for locating a vulnerable node in a power grid, a storage medium and an electronic device, wherein the method comprises calculating the mutual impedance between each node in the power grid and a harmonic source node; obtaining the current amplitude value of each harmonic source; obtaining the harmonic voltage generated by each node in the power grid according to the current amplitude values and the mutual impedance; and determining a node corresponding to the maximum value of the harmonic voltage as the vulnerable node of the power grid. The method for locating the vulnerable node in the power grid takes account of the influence of each harmonic source on each node in the power grid, is beneficial to quickly searching out the node sensitive to theinfluence of harmonics in the power grid, has great significance for treating the harmonics, and solves the problem in the prior art that the vulnerable node in the power grid is difficult to locatewhen multiple harmonic sources function together.