The invention relates to a supporting element (8) for an offshore wind turbine (3), comprising a base body (1) formed by a circular or polygonal basement (4), a shaft (5) with vertical walls and a plurality of vertical cavities (6) extending over the entire height thereof and a slab (2) dispose on the shaft (5) of the base body (1), on which slab (2) a wind turbine (3) is positioned and secured. The base body (1) of the supporting element (8) is produced using sliding formwork, from the basement (4) up to the upper base thereof. In addition, the method includes the following steps: ballasting the supporting element (8) by partially filling the above-mentioned vertical cavities (6); seaward towing the supporting element (8) from the production site thereof to the offshore wind turbine installation site; anchoring the supporting element (8) by filling the vertical cavities (6) completely; until the supporting element (8) rests on a stone bed (19) on the sea bed; and mounting the wind turbine (3).