Pipe orifice joint for airtight test and use method

The invention relates to a pipe orifice joint for an airtight test and a use method, the pipe orifice joint comprises a cylindrical rubber plug, a compensation gasket, a protective rubber pad, a pipe orifice cover plate, a handle nut and a self-sealing joint which are sequentially connected by a conical head hollow screw, the conical head hollow screw is provided with a through central through hole, the cylindrical rubber plug is matched with the inner diameter of a pipe orifice of an airtight chamber, and the center of the cylindrical rubber plug is provided with a through hole; the diameter of the protective rubber mat and the diameter of the pipe opening cover plate are larger than the outer diameter of a pipe opening of the airtight cavity, the outer diameter of the compensation gasket is the same as that of the columnar rubber plug, one side face of the compensation gasket is attached to the end face of the columnar rubber plug, the other side face of the compensation gasket is attached to the end face o