The invention provides a coordinated operation method of data transmission congestion of multiple photovoltaic power stations, and relates to the field of power grid dispatching. The coordinated operation method of data transmission congestion of multiple photovoltaic power stations comprises the steps of analyzing and calculating parameters which affect data priority classification and then describing the initial dynamic priority of the data of each photovoltaic power station by using a function; building an optimal distribution function by combining with environment parameters of each photovoltaic power station which affect the data transmission and a power generation power coefficient and setting a suitable priority threshold value; comparing the optimal distribution function value of the data transmission with the priority threshold set value to finish the priority classification; and finally realizing priority distribution of the overall data of each photovoltaic power station. According to the coordinated operation method of data transmission congestion of multiple photovoltaic power stations, the data with high priority are processed preferentially, the data congestion problem is solved and the utilization efficiency and the processing speed of the information data of each photovoltaic power station are improved.