As renewable energy sources in the grid increase, the utilization of distributed power sources has become a research focus, with the parallel connection of multiple small power sources to provide high-power output becoming a research hotspot. When two systems with different current sharing modes are connected in parallel, current sharing cannot be realized because information cannot be exchanged through communication links. Therefore, the Hall sensor is used in this study to collect the output current of the original system. Since the current sharing control strategy already exists in the original system, the average sampling current is taken as the output current when the original system reaches the current equalization state. Based on the historical data and the diffusion algorithm, the initial current value and the average normalized value of the power module in the new system are obtained. The output current is adjusted by module proportional operation, and the sample mean is used as the reference information of output current between different systems to realize output current adjustment. Finally, a simulation model is built in Matlab/Simulink, and the effectiveness of the proposed control strategy is verified by experiments, and the collaborative current sharing control between different systems is realized.