The invention discloses a distributed power supply grid-connected point and access mode selection method. The method includes the steps of: 1) determining power generation characteristics of distributed power supplies which need grid connection; 2) knowing the situation of a power grid of an area where the distributed power supplies are located, making statistics of capacity and load of a single main transformer of a public transformer substation of each voltage class, and calculating a weighted average of capacity of the main transformer of each voltage class; 3) preliminarily selecting a voltage class of grid connection according to power generation capacity of the distributed power supplies; 4) determining an access mode of the distributed power supplies; and 5) determining an access point of the distributed power supplies. By adoption of the distributed power supply grid-connected point and access mode selection method provided by the invention, influence of access on safe and stable operation of the power grid can be reduced to the greatest extent on the premise of ensuring effective access of the distributed power supplies to the power grid.