The invention discloses a wind and solar power generation and storage optimization method. The method comprises the following steps of: establishing an optimized power supply reliability constraint condition, a wind and solar complementary constraint condition, a storage battery capacity constraint condition and an electric power storage period failure condition; calculating a maintenance cost Cpre of an optimized target unit; calculating a loss cost caused by influences caused by power supply fluctuation of the optimized target unit, and setting P as a total output size of a wind and solar generating set and a storage battery set; establishing an economic optimization function; analyzing the working condition of a practically optimized target so as to evaluate the economy and reliabilityof optimized target power generation network; calculating Wi according to a formula, wherein Wi is a combined weight index of the wind and solar generating set and the storage battery set, Xi is eachweight calculation value and alpha is a balance index; if Wi is smaller than a set value Ws, searching a set mode needing switching, and if Wi is greater than the set value Ws, not carrying out action; arranging a set switching sequence; and waiting for the next round of data extraction and optimized calculation.