Vertical axis wind turbine, indistinctly applicable in land or sea, the main characteristic of which is its low visual impact due to the collapse of its tower and rotor as required by environmental or meteorological conditions.It is constituted by a structure that includes a base (3, 5), a plurality of supporting arms (10, 13), an elevation set (6, 7, 8) and a drive shaft (17) that acts on the generating elements (29) arranged at the base. Said structure supports a rotor (1) and its corresponding blades (2), attached by means of motorized shafts (20) that collapse and expand the blades (2) over the rotor (1).Whenever the electric motor (6) winds the tensioning element (8) attached to two pairs of lower arms (10), they rotate at their base and intermediate point and raise, during their movement, the upper arms (13) and the drive shaft (17). The entirety of this structure is secured with braces (21, 24), which act on the upper and lower part of their corresponding arms (10, 13), achieving a safe collapse and expansion.