The invention discloses a flexible and efficient fog/dust removing system and a technology thereof. The system comprises demister bodies, which are arranged in an absorbing tower and a flue, and a spraying device for washing the demister bodies; each demister body comprises a flexible blade and a fixing rack, and the flexible blade is fixed on the fixing rack. The system adopts a three-level demister body in an absorbing tower and a one-level demister body in a flue, wherein the demister bodies are both provided with a flexible blade; the flexible blade surface are rough and are covered by wear-resistant corrosion-resistant soft fiber fabrics, thus the flexible blade can absorb part of flue gas impact, at the same time, due to the uniform roughness of the blade surface, a uniform water membrane can be formed on the blade surface, the fine particles can be more easily be absorbed by the flexible blade therefore, the provided system and technology can achieve ultraclean discharge, compared with the conventional method that a wet-process deduster is added on a desulfurization system, the construction cost is reduced by 80%, and the operation cost is reduced by 90% or more.