The invention relates to a fuzzy chance constraint planning method and system for distributed power supply capacity distribution points of a distribution network. The method comprises the steps of establishing a distributed power supply capacity distribution point optimization target function according to active loss and a distributed type power supply operating cost calculation formula of the distribution network; establishing a distribution network safety operation constraint condition according to a flow power constraint; establishing a chance constraint condition according to a probability model of the distributed power supply and load random power; solving the target function according to the constraint condition and the change constraint condition; and performing optimization on the distributed power supply capacity distribution points according to the solving result, so that the uncertainty jointed planning problem of the distributed power supply capacity distribution points can be well solved. By means of converting an inequality constraint condition into the change constraint condition higher than certain confidence level, compromise between the target function optimum and the constraint conditions can be achieved, so that the problem existing in jointed optimization of the distributed power supply capacity distribution points of the distribution network can be well solved; and therefore, reliable technological support can be provided for distributed new energy power generation and safety operation of the intelligent power grid.