A system for improving sludge water into ecological water system, including a water area separator, a sludge dehydrator and a water filtration device, the water area separator separates the water area to be treated by a water barrier, the sludge dehydrator dehydrates the sludge by a centrifugal sieve; the water filtration device includes a suction pipe, a water pump, an inlet pipe, a filter bag, a steel cage and a drainage pipe. The system for improving sludge water into ecological water system has the mechanism of to separate the water area by the water area separator, then rapidly dehydrate the sludge by the sludge dehydrator, remove sundries from the treated sludge water by the water filtration device, and finally drains the water filtered after adding microbubbles, and thus to realize the improvement of sludge water into ecological water system.