The invention provides a rigidity seal ball valve which comprises a valve body, valve decks, valve seats, a valve ball, an upper valve rod and a lower valve rod. The valve ball is arranged in the valve body. The upper end of the valve ball is connected with the upper valve rod. The lower end of the valve ball is connected with the lower valve rod. The valve decks are mounted on the two sides of the valve body correspondingly. The valve seats are mounted in valve seat cavities formed in the valve decks correspondingly. Left valve seat cavity flow guide holes are formed and communicate with theleft valve seat cavity. One ends of the left valve seat cavity flow guide holes communicate with the position, at the inner side of a left valve seat seal ring, of the interior of the left valve seatcavity. The other ends of the left valve seat cavity flow guide holes communicate with the position, at the outer side of the left valve seat seal ring, of the interior of the left valve seat cavity.A left flow guide valve is arranged on the left valve seat cavity flow guide holes. Right valve seat cavity flow guide holes are formed and communicate with the right valve seat cavity. One ends of the right valve seat cavity flow guide holes communicate with the position, at the inner side of a right valve seat seal ring, of the interior of the right valve seat cavity. The other ends of the rightvalve seat cavity flow guide holes communicate with the position, at the outer side of the right valve seat seal ring, of the interior of the right valve seat cavity. A right flow guide valve is arranged on the right valve seat cavity flow guide holes.