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With the increase of high-speed rail loads scale and the integration of the large-scale wind power, the vulnerability of lines on the wind farm side is increasing. Thus, a vulnerability analysis method of integrated grid-connected system of cluster high-speed rail loads and wind farm based on the branch potential energy function is proposed in this paper. Firstly, a PSCAD model is established based on the actual parameters of traction power supply system and wind turbine. Secondly, a vulnerability analysis method based on the branch potential energy function is proposed. Finally, the simulations on a regional power grid in China show that compared with other methods, the proposed method considers the influence of the EMUs′ scale and the distance from the traction substation to the wind farm on the wind farm more comprehensively and accurately, and has practical application value.