The invention relates to the technical field of ecological restoration, and discloses a fixing device for preventing an impeller of an ecological restoration aerator from slipping, which comprises a blade, an impeller is fixedly connected to the middle of the blade, a fixed wheel is fixedly connected to the front side of the impeller, a rotating shaft is fixedly connected to the middle of the impeller, and a rotating mechanism is fixedly connected to the outer ring of the rotating shaft. A detection mechanism is fixedly connected into the rotating mechanism, locking mechanisms are fixedly connected into the rotating mechanism and located on the two sides of the detection mechanism, and an alarm mechanism is fixedly connected into the fixed wheel. According to the fixing device for preventing the impeller of the ecological restoration aerator from slipping, due to the fact that the impeller slips, a fixed wheel and a rotary disc are staggered to drive a connecting rod to move, the connecting rod drives a sliding block to move outwards, the sliding block drives a hook to move, a push block is released in the hook moving process, and the push block moves towards the inner side under the action of a spring after being released; the push block drives the swing rod to rotate, the automatic detection function is achieved, impeller slipping is found in time, and the equipment reliability is improved.