A high-performance triple-eccentric butterfly valve with bidirectional hard metal seal, characterized in that: the seat sealing ring is composed of a soft T-shaped sealing ring with multiple layers of stainless steel sheets on both sides. The sealing surface between the valve plate and the valve seat has a slanted conical structure, and a wear-resistant, temperature-resistant, and corrosion-resistant alloy material is welded onto the slanted conical surface of the valve plate. A spring fixed between the adjustment ring and the pressure plate is assembled together with the adjustment screw on the pressure plate. This structure effectively compensates for the tolerance band between the shaft sleeve and the valve body, as well as the elastic deformation of the valve stem under medium pressure, solving the sealing problems present during the bidirectional interchange of medium transmission in valves. Using a sealing ring composed of soft T-shaped rings with multiple layers of stainless steel sheets on both sides combines the dual advantages of metallic hard seals and soft seals, achieving zero leakage sealing performance in both low-temperature and high-temperature conditions. Tests have shown that when in the forward flow state (the direction of medium flow is the same as the rotation direction of the butterfly plate), the pressure on the sealing surface is generated by the torque of the transmission device and the effect of medium pressure on the valve plate. As the forward medium pressure increases, the slanted conical surface of the valve plate squeezes tighter against the sealing surface of the valve seat, improving the sealing effect. In the reverse flow state, the seal between the valve plate and the valve seat relies on the torque of the drive device pressing the valve plate against the valve seat. As the reverse medium pressure increases, when the unit normal pressure between the valve plate and the valve seat is less than the medium pressure, the deformation energy stored in the spring of the adjustment ring after being loaded compensates for the clamping pressure between the sealing surfaces of the valve plate and the valve seat, thereby providing automatic compensation.