A device for the continuous and discriminated positioning of each blade of hydraulic turbines at vertical axis, that is able to improve the hydrodynamic efficiency in the solution with vertical axis turbine, with discs and support arms, i.e. similarly to Darrieus and Kobold turbines, characterized by the arrangement of three electrical stepper motors on a single maneuvering screw for handling rotary-transfer and swinging movement of the blades and by the utilization of two separated coplanar floating disks placed on a rotating barrel layer, having: - a first electrical stepper motor (ref. 1 of Fig. 2) connected with a flange to its own worm gearbox (ref. 46 of Fig. 2) whose first crown gear (ref. 62 of Fig. 2) is rigidly connected to an end of a maneuvering and connection screw (ref. 4 of Fig. 2); - an assembly formed by a the first electrical stepper motor (ref. 1 of Fig. 2), its own worm gearbox (ref. 46 of Fig. 2), the maneuvering and connection screw (ref. 4 of Fig. 2), that can rotate on a pin (ref. 50) by an angle ± α in respect to a support (ref. 49), secured to a disk (ref. 48 of Fig. 1) that is connected to the hydraulic turbine by means of pillars (ref. 47 of Fig. 1); - the maneuvering and connection screw (ref. 4) that is moved by the first electrical stepper motor (ref. 1) receiving the rotary motion by the first crown gear (ref. 62), while the other end of the maneuvering and connection screw (ref. 4) is idle on the support attached to a box (ref. 64 of Fig. 3); - On the maneuvering and connection screw (ref. 4) are combined two separated female screws (ref.6 of Fig. 1 and Fig. 2; ref. 7 of Fig. 1 and Fig. 5), whereby for a given rotation of the first electrical stepper motor (ref. 1) the first female screw (ref. 6) moves for a certain distance rx: - On the first female screw (ref. 6) is hinged, in idle status, a roller (ref. 5) that will move for the same distance rx, whereby the idler roller (ref. 5) is connected to the fixed part of the hydraulic turbine and makes the repositioning rx of the housing support (ref. 8) that is instead connected to another floating disk (ref.40 of Fig. 5); - A second electrical stepper motor (ref. 2 of Fig. 1) is flanged on top of the box (ref. 64 of Fig. 3) that through a connecting joint sets in rotation a conical pinion (ref. 55), which engages a corresponding second crown gear (ref. 56 of fig. 3). - On the second crown gear (ref. 56) is keyed in an endless screw (ref. 57) that engages a third crown gear (ref. 58) that put in slow rotation a shaft (ref. 59), which has at its edge mounted a pinion (ref. 60) that engages a fourth crown gear (ref. 65) secured to the support disk (ref. 48 of Fig.1). - a first electrical stepper motor (ref. 1 of Fig. 2) connected with a flange to its own worm gearbox (ref. 46 of Fig. 2) whose first crown gear (ref. 62 of Fig. 2) is rigidly connected to an end of a maneuvering and connection screw (ref. 4 of Fig. 2); - an assembly formed by a the first electrical stepper motor (ref. 1 of Fig. 2), its own worm gearbox (ref. 46 of Fig. 2), the maneuvering and connection screw (ref. 4 of Fig. 2), that can rotate on a pin (ref. 50) by an angle ± α in respect to a support (ref. 49), secured to a disk (ref. 48 of Fig. 1) that is connected to the hydraulic turbine by means of pillars (ref. 47 of Fig. 1); - the maneuvering and connection screw (ref. 4) that is moved by the first electrical stepper motor (ref. 1) receiving the rotary motion by the first crown gear (ref. 62), while the other end of the maneuvering and connection screw (ref. 4) is idle on the support attached to a box (ref. 64 of Fig. 3); - On the maneuvering and connection screw (ref. 4) are combined two separated female screws (ref.6 of Fig. 1 and Fig. 2; ref. 7 of Fig. 1 and Fig. 5), whereby for a given rotation of the first electrical stepper motor (ref. 1) the first female screw (ref. 6) moves for a certain distance rx: - On the first female screw (ref. 6) is hinged, in idle status, a roller (ref. 5) that will move for the same distance rx, whereby the idler roller (ref. 5) is connected to the fixed part of the hydraulic turbine and makes the repositioning rx of the housing support (ref. 8) that is instead connected to another floating disk (ref.40 of Fig. 5); - A second electrical stepper motor (ref. 2 of Fig. 1) is flanged on top of the box (ref. 64 of Fig. 3) that through a connecting joint sets in rotation a conical pinion (ref. 55), which engages a corresponding second crown gear (ref. 56 of fig. 3). - On the second crown gear (ref. 56) is keyed in an endless screw (ref. 57) that engages a third crown gear (ref. 58) that put in slow rotation a shaft (ref. 59), which has at its edge mounted a pinion (ref. 60) that engages a fourth crown gear (ref. 65) secured to the support disk (ref. 48 of Fig.1).