The invention discloses a WebService-based power utilization data packet interactive interface method. The method includes the following steps: a data interface service of WebService provided by a power utilization collection system performs grouping and generates priority, allocates unique interaction data task ID numbers randomly, and returns the allocated task ID numbers to a target end; the data interface service performs grouping according to the volume of data needing interaction and performs sequencing according to priority of the tasks, and generates subtask ID numbers for each group of tasks; and after completion of preparation of data corresponding to the subtasks in sequence, the data interface service returns the corresponding subtask ID numbers to the target end, and the target end rapidly obtains the prepared data according to the subtask ID numbers. The method provided by the invention solves the problem of grouping and sequencing according to a priority strategy on the basis of the request data volume and specific data information in WebService real-time interaction, response is given in sequence, asynchronous interaction of packets is realized, and the method has good application prospects.