Mold for sealing fireworks paper tube and process for producing fireworks inner tube by using mold

The invention discloses a mold for sealing a fireworks paper tube. The mold is an integral piece, and comprises a connecting rod and a sealing base from top to bottom in sequence; a semi-spherical groove with a diameter matched with an outer diameter of the fireworks paper tube is formed in the bottom end of the sealing base; multiple fan-shaped grooves are peripherally formed in the groove wall of the top of the semi-spherical groove; the vertexes of all the fan-shaped grooves are positioned at the vertex of the semi-spherical groove, and arcs at the bottom ends are positioned on the same periphery of the groove wall of the semi-spherical groove; the depths of the fan-shaped grooves are gradually increased from one end to the other end in the peripheral direction; and solids between two adjacent fan-shaped grooves are arc edges. When the mold is used for producing the fireworks inner tube, the mold drives the tube wall at the upper end of the fireworks paper tube to twist to the axial center so as to finish