The invention provides a method and system for electricity transaction data picture generation. The method comprises the steps of loading a picture file; setting a data source related to a pixel of the picture file through data source parameters; designating the data source parameters by an external parameter file and relating the data source parameters to an electricity transaction scene; obtaining data corresponding to the data source in the picture file, and generating an electricity transaction picture. Compared with the proximal prior art, the method and system utilize the external parameter file for designating the data source related to the pixel, one pixel can be related to multiple data sources, and generation of pictures suitable for electricity transaction scenes is more convenient.