The invention discloses an image data generation method and device. The method comprises the steps that an initial power network of a power distribution network is obtained, the initial power network comprises a plurality of power network equipment data and equipment connecting data between power equipment; the initial power data are analyzed to obtain power network object data; on the basis of equipment object data and connecting object data in the power network object data, corresponding object diagram modules are generated; on the basis of the corresponding object attribute information of the equipment object data and the connecting object data, the corresponding object diagram modules are processed, and power network image data of the power distribution network are obtained.