Abstract: Continuous transmission by planetary gear-head referring to a mechanical transmission box (1), composed by one or more satellite gear head boxes (2) connected to the input (3) and output (4) for gears (5). The inversion of the movement, increase or decrease of the speed of rotation of the satellite boxes (2) are obtained by screws (6) connected to the same and driven by an electric motor or other source of mechanical rotation and controlled by a microprocessor, programmed with specific algorithms for each gear of the transmission box (forward, neutral and reverse).