This paper firstly in detail presents the operating principle and structural design of the new wet-gas recycling supersonic separator. This device can be used to separate hydration and liquid form natural gas without using chemicals, and there are some benefits including compact structure, small floor space, no chemical pollution and high separating efficiency. Owing to the swirl characteristics and resistance characteristics of cyclone have the important impact on the dehydration performance of wet-gas recycling supersonic separator, two experimental rigs individual with built-in cyclone A and B were constructed and systematic dehydration performance experimental investigations of rigs were carried out. To find the better cyclone design with small flow resistance, high swirl strength, high separation efficiency. The experimental results showed that cyclone A has better swirl characteristics, and cyclone B has better resistance characteristics. The recycling separator with cyclone A has the higher separation efficiency and better dehydration performance, so comparing with the resistance characteristics, the swirl characteristics has the greater impact on the dehydration performance of the recycling separator. The better swirl characteristics of the cyclone, the better dehydration performance of the recycling separator.