The utility model relates to a valve body forming and positioning clamp. The device comprises a bottom plate and a positioning assembly arranged on the bottom plate, the positioning assembly comprisesa fixed plate, a movable plate, a power component and a base. The base and the fixed plate are oppositely fixed on the bottom plate; wherein the movable plate and the fixed plate are arranged in parallel, the fixed plate is provided with a front positioning plate and a rear positioning plate, the front positioning plate is provided with a semi-circular groove matched with the appearance of a valve body, the rear positioning plate is provided with a 1/4 circular groove matched with the appearance of the valve body, and the movable plate opposite to the front positioning plate is provided witha front positioning column and a rotary positioning column. According to the utility model, the corresponding positioning plate and positioning column are arranged on the movable plate and the fixed plate; in addition, the positioning column above the movable plate is arranged to be of a rotatable structure, when the valve body is installed, more space is provided for placing of the valve body, the valve body is convenient to place, after the valve body is placed, the valve body can be directly clamped through a power part, the fixing procedure is simplified, and the production efficiency is improved.