In order to better control the cost of power resources and ensure the rational allocation of power resources, a construction method of multi-dimensional transaction optimization model of power market considering the uncertainty of source load is proposed. Combined with the uncertainty characteristics of source load, the characteristic structure and transaction impact information of power market are standardized, and the multi-dimensional transaction management algorithm of power market is constructed to improve the multi-dimensional transaction model structure of power market. Finally, it is confirmed by experiments, The multidimensional transaction optimization model of power market considering source load uncertainty has high practical value and fully meets the research requirements.