The invention relates to a wedge type hard sealing ball valve. The wedge type hard sealing ball valve comprises a valve body, a valve deck, an operating mechanism, a valve rod, a ball body and a valve seat. A valve cavity is formed inside the valve body, medium channels are arranged on the two sides of the valve cavity, and the ball body is arranged inside the valve cavity. One end of the valve rod penetrates through the valve deck and is in linkage with the ball body, and the operating mechanism is linkage with the other end of the valve rod. The valve seat is fixed to the corresponding position of the medium channels of the valve cavity and matched with the ball body. A protruding wall surrounding the valve rod is arranged in the valve deck, the valve rod is provided with a protruding ring, and the outer diameter of the protruding ring is matched with the inner diameter of the protruding wall. The outer wall of the valve rod, the upper wall of the protruding ring, the inner wall of the protruding wall and the inner wall of the valve deck form an annular containing cavity, and a sealing gasket is arranged inside the annular containing cavity. An adjusting nut connected with the valve rod in a threaded mode is arranged at one end, opposite to the ball body, of the valve rod. According to the technical scheme, the wedge type hard sealing ball valve has the advantage that leakage does not occur between the valve deck and the valve rod easily.