Bidirectional sealing structure and butterfly valve

The invention relates to a two-way sealing structure and a butterfly valve and relates to the technical field of valves, the two-way sealing structure comprises a valve seat and a valve element arranged in the valve seat, and the valve element comprises a valve element body, a valve element pressing ring and an elastic sealing ring; the valve element pressing ring is arranged on one side of the outer end of the valve element body, the elastic sealing ring is clamped between the valve element pressing ring and the valve element body, and the outer end of the elastic sealing ring protrudes out relative to the valve element body and the valve element pressing ring. A movable gap is formed between the valve element pressing ring and the valve element body, the movable gap is used for allowing the valve element pressing ring to move towards or away from the elastic sealing ring, the valve element pressing ring is provided with a limiting piece, the limiting piece is fixedly connected with the valve element body, a