The invention discloses a distributed power supply energy efficiency optimization method and system. Scheduling control is carried out from a day-ahead time scale and a day time scale, and modeling and optimization are respectively carried out on the two phases. A load is divided into an uncontrollable load, a translational load and a reducible load, an optimization model takes minimization of the sum of an energy storage cost in a scheduling period, an interaction cost with an upper power grid and a load cost as a target, features of a distributed power supply, energy storage and multi-element loads are taken into integrated consideration, interactive links among the three are enhanced, good interaction between a generating side and a load side is realized, and while regenerative energy is fully utilized, the integrated utilization efficiency of energy is improved.