The utility model relates to a slip casting orifice device in pit, including a body, an unfamiliar device and a manometer, body one end is passed through the diaphragm device with the manometer is connected, slurry inlet and thick liquid export have been seted up to the body lower extreme, slurry inlet and slip casting tube coupling, the thick liquid export communicates with treating slip casting drilling, the diaphragm device includes gland, lower gland and diaphragm, upward the gland is lou hopper -shaped with lower gland, goes up the gland and closes the connection with lower gland lid, encloses a closed form one -tenth cavity, the diaphragm is located go up between gland and the lower gland, will the cavity is separated for upper plenum and lower cavity, the saturation is filled in the upper plenum has hydraulic oil, down the cavity with the body intercommunication. This slip casting orifice device in pit structural design is reasonable, keeps away avoiding pressure power through the mode of medium isolation and shows sensing plunger and thick liquid direct contact in the head to avoid the loss of manometer, improved ressure measurement's accuracy simultaneously.