The invention discloses a method for quickly obtaining dynamic equivalence parameters of a power collection network of a wind power plant, relates to the technical field of power system simulation modeling, and aims to solve the problems that an existing method for obtaining the equivalence parameters of the power collection network is low in precision, and the obtained equivalence parameters only can ensure equivalence in a steady-state process and have an error in a transient process. The method comprises the steps of building a simulation model of the wind power plant with the complete power collection network; determining the position of each group of wind power units according to the simulation model of the wind power plant and wind speed data and a grouping index in the wind power plant; obtaining corresponding power collection network equivalent impedance of an equivalence machine formed by aggregating a group at t moment; obtaining resistance and inductance; and then obtaining equivalent ground capacitance corresponding to the equivalence machine according to the condition that reactive power of ground capacitance of a cable or an overhead line corresponding to a group of wind power units before equivalence is equal to reactive power of ground capacitance of an equivalent cable or overhead line corresponding to the group of wind power units equivalent to a unit. The method is used for calculating the dynamic equivalence parameters of the power collection network of the wind power plant.