A steering structure comprising a front wheel hub, a front end of a vehicle body of a portable two-wheeled vehicle and an internal steering structure, the steering structure comprising: a front wheel mounted on the front end of the vehicle body of the two-wheeled vehicle; and handlebars provided at the front end of the vehicle body of the two-wheeled vehicle; the internal steering structure including a steering bearing sleeve that is vertically fixed to the front end of the vehicle body; wherein the steering bearing sleeve is provided with a steering bearing fixing rod which is rotatable within the steering bearing sleeve; wherein a steering bearing fixing rod is fixedly connected to the handlebars and is rotated synchronously with the handlebars; wherein a rotatable front wheel is provided on the steering bearing fixing rod; said front wheel includes a fixed internal hub and an outer wheel rotatable relative to said fixed hub; the fixed internal hub is annular and the plane which the fixed internal hub is located coincides with the axis of the steering bearing fixing rod; and characterised in that a fixed mounting seat is provided on the fixed internal hub, and the fixed internal hub is fixedly mounted on the steering bearing fixing rod through the fixed mounting seat, and said handlebars are mounted on said fixed mounting seat; wherein said outer wheel includes an outer hub and a tire disposed on said outer hub, and further including a rotation coupling device; the outer hub is rotatably fitted to the outer ring of the fixed internal hub by the rotation coupling device; wherein said rotation coupling device comprises: a ball holder provided between the outer hub and the fixed internal hub, and a plurality of balls provided in the frame, and the balls being in rolling contact with the outer hub and the fixed hub, respectively; wherein a mounting hole is provided in a middle portion of the fixed mounting seat, and said fixed internal hub being perforated through said mounting hole via bolts, so that said fixed hub is fixedly mounted on said steering bearing fixing rod; the fixed mounting seat is provided with a mounting fixing hole at both ends thereof respectively, the ends of the handlebars have a left branch and a right branch, and the left and right branches are respectively mounted to a mounting fixing hole at both ends of the fixed mounting seat by a fixing bolt; and a space for rotation of the outer wheel is formed between the left branch and the right branch. a front wheel mounted on the front end of the vehicle body of the two-wheeled vehicle; and handlebars provided at the front end of the vehicle body of the two-wheeled vehicle; the internal steering structure including a steering bearing sleeve that is vertically fixed to the front end of the vehicle body; wherein the steering bearing sleeve is provided with a steering bearing fixing rod which is rotatable within the steering bearing sleeve; wherein a steering bearing fixing rod is fixedly connected to the handlebars and is rotated synchronously with the handlebars; wherein a rotatable front wheel is provided on the steering bearing fixing rod; said front wheel includes a fixed internal hub and an outer wheel rotatable relative to said fixed hub; the fixed internal hub is annular and the plane which the fixed internal hub is located coincides with the axis of the steering bearing fixing rod; and characterised in that a fixed mounting seat is provided on the fixed internal hub, and the fixed internal hub is fixedly mounted on the steering bearing fixing rod through the fixed mounting seat, and said handlebars are mounted on said fixed mounting seat; wherein said outer wheel includes an outer hub and a tire disposed on said outer hub, and further including a rotation coupling device; the outer hub is rotatably fitted to the outer ring of the fixed internal hub by the rotation coupling device; wherein said rotation coupling device comprises: a ball holder provided between the outer hub and the fixed internal hub, and a plurality of balls provided in the frame, and the balls being in rolling contact with the outer hub and the fixed hub, respectively; a ball holder provided between the outer hub and the fixed internal hub, and a plurality of balls provided in the frame, and the balls being in rolling contact with the outer hub and the fixed hub, respectively; wherein a mounting hole is provided in a middle portion of the fixed mounting seat, and said fixed internal hub being perforated through said mounting hole via bolts, so that said fixed hub is fixedly mounted on said steering bearing fixing rod; the fixed mounting seat is provided with a mounting fixing hole at both ends thereof respectively, the ends of the handlebars have a left branch and a right branch, and the left and right branches are respectively mounted to a mounting fixing hole at both ends of the fixed mounting seat by a fixing bolt; and a space for rotation of the outer wheel is formed between the left branch and the right branch.