Cutting mechanism for ocean engineering structural pipe

The utility model discloses an ocean engineering structural pipe cutting mechanism which comprises a hoop, the hoop comprises an upper half hoop and a lower half hoop, a plurality of supporting blocks evenly distributed in the circumferential direction of the hoop are fixed to the inner wall of the hoop, a motor installation base is arranged on the outer wall of the hoop in a sliding mode in the circumferential direction, and a center motor is fixedly installed on the inner side of the motor installation base. Outer tooth half gear rings are fixed to the front side of the upper half hoop and the front side of the lower half hoop correspondingly, the two end faces of the two outer tooth half gear rings are attached to each other to form an outer tooth gear ring, the output shaft end of the center motor is fixedly connected with a gear matched with the outer tooth gear rings, and a driving air cylinder is fixedly installed on the front side of the motor installation base. A piston shaft end of the driving cylin