The invention discloses an offshore platform which comprises a barge and positioning columns. First through holes are formed in the barge, a lifting mechanism is arranged above each first through hole, and the positioning columns are arranged in the lifting mechanisms and the first through holes in a penetrating mode; each lifting mechanism comprises two first panels, the two first panels are connected together through a plurality of first hydraulic cylinders, second through holes used for penetrating through the positioning columns are formed in the two first panels, the two sides of each second through hole are respectively provided with a supporting frame, the supporting frames are fixed on the first panels, tooth blocks are hinged to the supporting frames, each tooth block is in a bent shape, second hydraulic cylinders are hinged to the tooth blocks, and the second hydraulic cylinders are hinged to the first panels; each positioning column comprises a column type steel structure frame body, a plurality of supporting rods are arranged in the frame bodies, racks are arranged on two opposite outer side faces of each frame body, and the tooth blocks are matched with the racks. The offshore platform is simple and convenient to control, and the barge of the same kind can bear longer supporting rods and can work in a deeper sea area.