The invention discloses a construction method for a large-scale energy base ultra-high voltage power transmission power grid structure scheme. The construction method comprises the following steps that: 1) constructing a large-scale energy base ultra-high voltage power transmission power grid initial model; 2) determining 2-3 pieces of direct-current back-to-back capacity values; 3) determining 2-3 pieces of direct-current back-to-back alternating current drop point schemes; 4) obtaining a plurality of planning net racks, and then, taking each planning net rack as an original selection schemeto construct an original selection scheme set; 5) carrying out electrical property analysis on each planning net rack; 6) when a preset requirement is not met, deleting the planning net racks from theoriginal selection scheme set; 7) when the original selection scheme processed through the 6) is an empty set, jumping to the 2), and otherwise, jumping to 8); 8) carrying out economic analysis on each planning net rack in the original selection scheme set; and 9) according to a multi-objective optimization planning model, selecting an optimal planning net rack. By use of the method, electrical properties and economical efficiency can be synthesized to realize the construction of the power grid structure scheme.