The invention discloses a group division method for large-scale access of distributed photovoltaic to a rural power distribution network, belongs to the field of novel energy application, and particularly relates to a group division method for distributed photovoltaic. The method comprises the steps of acquiring related network parameters of the power distribution network, a photovoltaic power supply and load data; selecting and calculating photovoltaic group division indexes; calculating a similarity matrix, and establishing a photovoltaic power supply network; and clustering and grouping photovoltaic power generation units based on an improved FCM algorithm. The group division method provided by the invention has relatively strong source-load coupling.