The invention provides an optimal selection method of a DC transmitting-end connection scheme of an energy base including a local power grid based on a gray correlation degree, which includes the following steps: (1) selecting evaluation indexes reasonably and calculating an evaluation index value of each connection scheme; (2) calculating the weight of each evaluation index; and (3) providing theoptimal selection method of the connection scheme based on the gray correlation degree. The method can provide a theoretical basis for the selection of the DC transmitting-end connection scheme of the energy base including the local power grid.