Different from the trunnion mounted ball valve, the ball of the floating ball valve can float freely, and it can rotate freely according to the direction of the flow of the medium when the valve is working, so as to realize the on-off and adjustment of the medium. The structure includes valve body, ball, valve stem, sealing surface, check device and ball seat and other components. When the valve is opened and closed, the valve stem drives the sealing surface and the ball to rotate together to control the switch of the medium. The advantage of the floating ball valve is that it has good fluid control performance in low pressure and high flow media.