The invention discloses a method for determining peak shaving capacity of a pipeline, and belongs to the field of pipelines. The method comprises the following steps that a plurality of first non-uniform coefficients that the maximum use fluid amount of all typical users deviates from the average use fluid volume within the preset period in a pipe network are obtained, each first non-uniform coefficient is equal to (the maximum use fluid amount of the users-the average use fluid volume of the users)/the average value of each first non-uniform coefficient, the product of the average value of the first non-uniform coefficients and the fluctuation coefficient serves as a second non-uniform coefficient of the whole pipe network, and the product of the second non-uniform coefficient and the total use fluid quantity average value of all users of the pipe network is used as a pipeline peak shaving capacity. According to the method, the first non-uniform coefficients and the second non-uniform coefficient are obtained, so that the network is obtained under the condition that the use demand of the users is the largest, and the peak shaving capacity of the pipeline in the preset time periodrange can be obtained.