The invention discloses a wedge type radial sealing ring. A cavity for micro-leakage flow exists between a boss of a flange sealing surface and a flange gasket, cylindrical sealing strips for blockingthe cavity for micro-leakage flow is arranged in a cavity formed by the flange gasket and the boss of a flange sealing surface in a penetrating manner, a U-shaped sealing strip is arranged above theflange gasket and the cylindrical sealing strip, two lip edges of the U-shaped sealing strip are respectively pressed on cylindrical sealing strips on two sides of the flange gasket, and a plurality of wedge blocks are arranged above the U-shaped sealing strip and are locked through steel strips. Under the acting force of locking of the steel belts, the wedge blocks generate pressure on the U-shaped sealing strip, and the pressure acts on the cylindrical sealing strips; and glue injection is carried out in the u-shaped sealing strip, so that the cavity between the U-shaped sealing strip and the flange gasket is filled with glue to achieve the sealing purpose. The wedge type radial sealing ring is suitable for flange medium micro-leakage treatment and protection of various different specification conditions, and is particularly suitable for the field of micro-leakage of petroleum and chemical radial sealing points; and the sealing effect is good, the operation is easy and convenient toachieve, and the safety and reliability are achieved.