The slurry knife gate valve is divided into two types, one is the split type and the other is the integral type. The split type slurry knife gate valve body adopts the “U” and “t” composite structure of composite material configuration. The integral valve body seal adopts the structure of “O” type compound seal ring, which overcomes the shortcomings of “U” type gasket used in the original pair clamp slurry valve, such as easy displacement and deformation, medium leakage and so on