The invention relates to a vertical tap fastening device, located in one end of a column (6) that houses water pipes (13, 13'), with a main body (1) that houses water conduits (11, 11'), the conduits (11, 11') being intended to connect the water pipes (13, 13') to the corresponding water systems of the general installation, the device comprising attachments (2) that incorporate a levelling element (4) and an opening (3) for fastening to the floor, a watertight container (5) for the installation of the tap (22) in the device, a first adjusting part (7) with a mouth intended for coupling the column (6), and a second adjusting part (8) with a pair of ducts intended to house joints (14) located in the ends of the water pipes (13, 13') of the column (6).