The invention provides a pipe spherical joint reinforcement sealing structure. The pipe spherical joint reinforcement sealing structure comprises a screwing-in joint, a ball pipe section and a pressing nut for achieving the external fixing effect. A tubular soft metal flange is arranged between the top of a ball of the ball pipe section and a gap in the bottom face of a conical hole of the screwing-in joint, and tubular-structure circulation media are arranged inside the tubular soft metal flange. The tubular soft metal flange comprises a tubular part and a protruding part extending from the head of the tubular part outwards. The outer surface of the protruding part is a conical surface and is in contact with the inner conical hole face of the screwing-in joint. The bottom of the protruding part is matched with the top face of the ball of the ball pipe section and can be fixedly clamped on the top face of the ball. The pipe spherical joint reinforcement sealing structure has the advantages that the tubular soft metal flange sealing structure is additionally arranged between the spherical surface of a spherical pipe section of a spherical joint and an inner conical hole of the screwing-in joint, the media flow through a pipe of the tubular soft metal flange, an annular sealing band is changed into a face sealing band, and the sealing reliability is improved.