Abstract: A sealing element for a ball valve with a first sealing ring and a second sealing ring whose central axes are parallel, the first sealing ring and the second sealing ring being made of different materials, and the first sealing ring being located on a side of the second sealing ring facing towards a ball in a ball valve in an axial direction, and being used to make contact with a spherical surface of the ball to form a seat The first and second sealing rings are fixed together, and the first sealing ring is a stamped annular polytetrafluoroethylene (PTFE) sheet. Since PTFE has a very low friction coefficient, the friction torque between the first sealing ring and the spherical surface of the ball is relatively small, and the first sealing ring does not wear easily and is not prone to sealing failure. A ball valve using the sealing element is also disclosed.