The invention discloses an efficient water-saving polyester dyeing process. Micron-order white mica powder and corresponding pure natural plant colorant are adopted, and under the action of selected leveling agent and chelating disperse agent, dyeing color difference is small, and color fastness is high; meanwhile, in follow-up liquid waste treatment, difficulty and cost are lowered, and the polyester dyeing process is efficient, water saving and environment friendly and conforms to the national industry policy of water conservation, energy conservation and emission reduction.