The invention discloses an external sheathing package self-closing-in steel structure joint and a manufacturing method thereof. The steel structure joint comprises a cylindrical base body, a ball headrod and a curing sliding film layer, the ball head rod is closed in and subjected to sheathing package inwards and is provided with a ball head, and the curing sliding film layer is cured on the inner surface of the cylindrical base body and matched with the ball head rod; a cylindrical closing-in tool matched with the cylindrical base body in shape, provided with an opening in the upper end andprovided with slopes on the opening from outside to inside is adopted to carry out three-segment type buffer closing in, before closing in, a tool retracting groove meeting the deforming needs is formed in the bottom of the inner surface of the cylindrical base body in advance, wherein the slopes have 30 degrees, 20 degrees and 10 degrees with the axis. The steel structure allows in-situ rotation,axial pulling out is prevented, self closing in is achieved, mounting is easy, and the structure is stable.