The invention discloses a method and a device for allocating distributed generation planned quantity. The method comprises the steps of determining the allocation proportions of the distributed generation planned quantity in every provinces under a plurality of influence factors according to the pre-obtained values of the plurality of influence factors affecting the allocation of the distributed generation planned quantity in all the provinces of Chinese Mainland, allocating the distributed generation planned quantity to various provinces according to different influence factors in combination with the pre-obtained weight values of the influence factors and the allocation proportions of the distributed generation planned quantity in various provinces under the influence factors, thereby obtaining the target allocated quantity values of each province under different influence factors, and finally, adding the target allocated quantity values of each province under various influence factors, thereby obtaining the final target allocated quantity of each province. The method is used for provincially allocating the distributed generation planned quantity by taking into the plurality of influence factors affecting the allocation of the distributed generation planned quantity into account, and thus convenient for putting the national overall planned quantity into practice and effect in all the provinces.