Steel pipe joint closing equipment

The utility model relates to a steel pipe seam closing device which comprises a base, an outer ring frame is arranged on the base in a rotating mode, a gear ring is arranged on the outer ring frame and connected with a driving gear in a meshed mode, the driving gear is fixed to the output end of a rotating driving mechanism, an inner ring frame is supported in the outer ring frame through a plurality of spokes, and the inner ring frame is connected with the inner ring frame in a meshed mode. At least three groups of mounting seats for mounting first linear driving cylinders are arranged in the circumferential direction of the inner ring frame, supporting rods capable of moving in the radial direction of the inner ring frame are arranged on the mounting seats, and a mounting bracket is fixed at one end, extending into a central shaft hole of the inner ring frame, of each supporting rod; a roller of which the outer surface of the middle part is of a concave arc-shaped structure is fixed to the mounting bracket,