The invention discloses a power quality constraint index analysis method of a distributed power generation access system. The method includes the steps that power quality constraint indexes are ranked; first planning of the distributed photovoltaic consumption capacity is carried out aiming at voltage deviation constraint indexes of all nodes; the planning result Si of the i node serves as thecapacity limiting value, and second planning of the distributed photovoltaic consumption capacity is carried out aiming at harmonic current constraint indexes of all the nodes; the planning result Siof the i node serves as the capacity limiting value, and third planning of the distributed photovoltaic consumption capacity is carried out aiming at harmonic voltage constraint indexes of all the nodes; Si/3 serves as the single-phase capacity limiting value of the i node, and fourth planning of the distributed photovoltaic consumption capacity is carried out aiming at the unbalance degree constraint indexes of all the nodes. By means of the power quality constraint index analysis method of the distributed power generation access system, the problem of misconvergence of multi-dimension multi-index constraint planning is effectively solved.