The invention relates to the technical field of water lifesaving, in particular to an anti-wave lifesaving cap. The device comprises a rubber outer cover, wherein the rubber outer cover is in a hat shape with an opening at the lower end, the lower end of the rubber outer cover is connected with a neck ring with elastic force, the neck ring is connected with a spiral spring steel wire framework anda folding framework, and the rubber outer cover sleeves the spiral spring steel wire framework and is supported by the spiral spring steel wire framework and the folding framework. According to the anti-wave lifesaving cap, the anti-wave lifesaving cap is worn after a life jacket is worn, in large wind waves condition, even if people is involved in water in a short time, the space air capacity inthe hat can ensure the oxygen supply amount in a certain time, and under the buoyancy effect of the life jacket, as long as the anti-wave lifesaving cap is exposed out of the water surface, people can breathe normally, so that choking and water filling due to wind waves are avoided, the occurrence of drowning accidents is avoided, the structure is simple, folding can be achieved, and storage is easy.