With the continuous improvement of wind power grid-connected capacity and the increasing number of DC transmission projects in the network, a large number of power electronic equipment accesses have caused some new features in the system"s cascading failure mode and evolution process. This paper firstly analyzes the influencing factors and development. The process and other aspects compare and analyze the difference between the traditional breaking process of the traditional cascading failure of the power grid and the cascading failure process after the large-scale wind power is connected to the grid. Secondly, based on the traditional cascading failure tidal current entropy analysis method, the voltage entropy and frequency entropy which may cause the fan to be off-grid in successive breaking are introduced, and the calculation formula is constructed. The factors affecting the development of cascading failure are proposed. Based on the comprehensive entropy vector, the method for judging the influencing factors of cascading failure and the corresponding process are given, which provides a technical means for quantitative analysis and evaluation of the influencing factors of cascading failure after large-scale wind power integration. The simulation results show that the proposed method can effectively reflect the causes and development process of cascading failures in the grid. Finally, the corresponding cascading failure prevention and control measures are proposed.