The invention discloses a pivot hinge with a closing buffer structure. The pivot hinge comprises a hinge box, a hinge cup, a connecting piece, a closing mechanism and a buffer mechanism, wherein the hinge box is provided with a containing cavity, and one side of the containing cavity is provided with an opening; the hinge cup is provided with an installing groove; one end of the connecting piece is rotatably fixed to the containing cavity, the other end of the connecting piece stretches out from the opening and is rotatably fixed to the installing groove, and the connecting piece can rotate around a fixing part so that combining and separating of the hinge box and the hinge cup can be achieved; the closing mechanism is fixed into the installing groove and abuts against the connecting piece, and when the hinge box is separated from the hinge cup, closing force is provided for closing rotating of the connecting piece; and the buffer mechanism is arranged in the containing cavity, abuts against the connecting piece and is used for supplying buffer force to decelerate closing rotating of the connecting piece during combining movement of the hinge box and the hinge cup. The hinge box and the hinge cup of the pivot hinge are fixed to two components needing to be closed correspondingly, and the closing speed of the two components during closing movement is moderate and steady through the closing force and the buffer force provided by the closing mechanism and the buffer mechanism.