The invention discloses a pipeline control valve, and particularly provides a floating ball valve. The floating ball valve comprises a valve body, a valve rod, a ball body and a valve seat. The valve seat is provided with a V-shaped groove and a chamfer structure. The cross section of the V-shaped groove is V-shaped. The opening end of the V-shaped groove is positioned on the outer circle side of the valve seat and contacts with the valve body. The chamfer structure is positioned on the end face, away from the ball body, of the valve seat and is a recessed tangent plane. Through new design of a valve seat structure, a valve rod guide structure and a valve rod sealing structure, the problem that positions, between the ball body and the valve seat and between the ball body and the valve rod, of the floating ball valve are easy to leak during actual working is solved, sealing of the positions, between the ball body and the valve seat and between the ball body and the valve rod, of the floating ball valve is improved, internal leakage and external leakage of the floating ball valve are avoided, and safety and reliability of the ball valve are guaranteed.