A cable-driven robot comprising: a base structure; a platform which must be moved with respect to the base structure in a three-dimensional space; a plurality of motor means (M1, M2,.., Mi,..Mn) which are predisposed and mounted at respective positions (P1, P2,...Pi,..Pn) on the base structure; a plurality of movement cables (C1, C2,..., Ci,.., Cn) of the platform, each of the movement cables (C1, C2,..., Ci,.., Cn) being fixed, at a first end thereof, to a relative fixing point to the platform and, at a second end thereof, to a respective motor means of the plurality of motor means (M1, M2,.., Mi,..Mn), each of the motor means (M1, M2,.., Mi,..Mn) being predisposed and activatable in such a way as to be able to wind and unwind the relative movement cable for the movement of the platform with respect to the base structure, a shaft mounted on the platform with the possibility of being put in rotation with respect to the axis thereof; a supplementary movement cable; a supplementary activating motor means predisposed and mounted at a respective position (Pa) on the base structure, the supplementary movement cable being fixed, at a relative first end, to the supplementary activating motor means and being wound with a portion of the length thereof on the shaft, the supplementary activating motor means being predisposed and activatable so as to be able to wind and unwind the supplementary movement cable and so as to be able to apply, via the supplementary movement cable, an angular momentum on the shaft and thus to set the shaft in rotation with respect to the platform according to a first rotation direction, means for setting the shaft in rotation with respect to the platform in a second rotation direction opposite the first rotation direction, characterised in that the supplementary movement cable is wound by a portion of the length thereof on the shaft and fixed, at a relative second end, on the shaft, the means for setting the shaft in rotation in a second rotation direction comprising a spiral torsion spring which is predisposed coaxially to the shaft and fixed, at a first end thereof, to the shaft and at a second end thereof, to a fixed point on the platform. a base structure; a platform which must be moved with respect to the base structure in a three-dimensional space; a plurality of motor means (M1, M2,.., Mi,..Mn) which are predisposed and mounted at respective positions (P1, P2,...Pi,..Pn) on the base structure; a plurality of movement cables (C1, C2,..., Ci,.., Cn) of the platform, each of the movement cables (C1, C2,..., Ci,.., Cn) being fixed, at a first end thereof, to a relative fixing point to the platform and, at a second end thereof, to a respective motor means of the plurality of motor means (M1, M2,.., Mi,..Mn), each of the motor means (M1, M2,.., Mi,..Mn) being predisposed and activatable in such a way as to be able to wind and unwind the relative movement cable for the movement of the platform with respect to the base structure, a shaft mounted on the platform with the possibility of being put in rotation with respect to the axis thereof; a supplementary movement cable; a supplementary activating motor means predisposed and mounted at a respective position (Pa) on the base structure, the supplementary movement cable being fixed, at a relative first end, to the supplementary activating motor means and being wound with a portion of the length thereof on the shaft, the supplementary activating motor means being predisposed and activatable so as to be able to wind and unwind the supplementary movement cable and so as to be able to apply, via the supplementary movement cable, an angular momentum on the shaft and thus to set the shaft in rotation with respect to the platform according to a first rotation direction, means for setting the shaft in rotation with respect to the platform in a second rotation direction opposite the first rotation direction, characterised in that the supplementary movement cable is wound by a portion of the length thereof on the shaft and fixed, at a relative second end, on the shaft, the means for setting the shaft in rotation in a second rotation direction comprising a spiral torsion spring which is predisposed coaxially to the shaft and fixed, at a first end thereof, to the shaft and at a second end thereof, to a fixed point on the platform.