End cover combined sealing structure of ultrahigh-pressure and large-cylinder-diameter cold isostatic press

The invention discloses an end cover combined sealing structure of a ultrahigh-pressure and large-cylinder-diameter cold isostatic press. The structure comprises a support ring, a triangular sealing ring and a Yx type sealing ring; a center pressure ring, an inner side pressure ring and a mounting ring are arranged on the inner side of an end cover of a cold isostatic press; the inner side pressure ring and the mounting ring both coat the center pressure ring; the inner side pressure ring is positioned on the inner side of the mounting ring; the support ring, the triangular sealing ring and the Yx type sealing ring are all positioned in a mounting cavity formed by the mounting ring, a working cylinder and the inner side pressure ring; the triangular sealing ring and the Yx type sealing ring are both arranged on the inner side of the support ring; an inclined surface is arranged on the outer side of the outer end of the Yx type sealing ring, and is matched with a first surface of the triangular sealing ring; a