Abstract: To address the issue of source-load uncertainty in microgrids under a low-carbon background, which complicates the lean configuration of microgrid capacity, a method for optimal configuration for microgrid with hydrogen storage is proposed considering the source-load uncertainty and the fusion interaction of green certificate and laddered carbon trading. First, the structure diagram of the grid-connected hydrogen storage microgrid is presented and its mathematical model is established. Secondly, a microgrid capacity optimal configuration model considering the fusion interaction of green certificate and laddered carbon trading is established under the deterministic scenarios. Subsequently, based on this deterministic scenario, the conditional value at risk (CVaR) and information gap decision theory (IGDT) are utilized to address the long-short term of uncertainties in source-load. Additionally, a model for the low-carbon optimal configuration of hydrogen energy storage microgrid capacity is established and solved by the CPLEX solver. Finally, the validity of the proposed model is verified through example analysis, which offers insights into the optimal configuration of hydrogen energy storage microgrids.