Non-blocking spiral composite intercepting device

The utility model relates to a non-blocking spiral composite intercepting device which comprises an intercepting bag, a spiral conveying mechanism, a conveying mechanism and a separating device, the spiral conveying mechanism is arranged in the intercepting bag, the height of an inlet of the intercepting bag is not smaller than the water depth of a seawater inlet of a nuclear power station, and an outlet of the intercepting bag is communicated with an inlet of the conveying mechanism. An outlet of the conveying mechanism is communicated with an inlet of the separating device; the intercepting bag is used for intercepting marine litter and marine organisms, the spiral conveying mechanism is used for cutting the marine litter in the intercepting bag and conveying the marine litter to an outlet of the intercepting bag, and the conveying mechanism is used for conveying the marine litter and the marine organisms at the outlet of the intercepting bag into the separating device. And the separation device is used for