A lifting device for maintenance and repair of motorized two-wheeled vehicles, which device comprises: - a base frame designed to rest on the ground; - a substantially horizontal platform placed on top of said frame; - a scissor mechanism interposed between said frame and said platform, having two pairs of mechanical arms pivoted together proximate to a central portion thereof; - at least one single-acting hydraulic cylinder acting on said scissor mechanism for lifting and lowering said platform and having a lower end pivoted to the frame; - an electric pump and a reservoir for collecting the hydraulic fluid, which are connected to said cylinder via a hydraulic circuit; wherein said hydraulic circuit comprises a first pilot solenoid valve along a first branch connecting said electric pump with said cylinder and a second pilot solenoid valve along a second branch of the circuit connecting said cylinder to said reservoir; wherein said first and second solenoid valves can be opened on command to allow the fluid to be discharged from said cylinder to said reservoir when said platform is being lowered; wherein said platform is a single platform whose plan size is sufficient to support one motorized vehicle at a time, wherein both said solenoid valves (13, 15) are normally closed to maintain said platform at a predetermined height and to prevent inadvertent discharge or leakage of the fluid in the event of failure even of only one of said solenoid valves (13, 15), said first branch comprising a non-return valve placed inside said electric pump so that, in the event of technical failures, said platform remains locked in position, characterized by said hydraulic circuit having a third branch adapted to directly connect said reservoir to said cylinder near said lower end to create a negative pressure therein as said platform is being lowered, the arrangement being such that the fluid drawn from said reservoir is vaporized and the vapors are deposited on the inner walls of said cylinder, thereby lubricating it and increasing the safety of the device. - a base frame designed to rest on the ground; - a substantially horizontal platform placed on top of said frame; - a scissor mechanism interposed between said frame and said platform, having two pairs of mechanical arms pivoted together proximate to a central portion thereof; - at least one single-acting hydraulic cylinder acting on said scissor mechanism for lifting and lowering said platform and having a lower end pivoted to the frame; - an electric pump and a reservoir for collecting the hydraulic fluid, which are connected to said cylinder via a hydraulic circuit; wherein said hydraulic circuit comprises a first pilot solenoid valve along a first branch connecting said electric pump with said cylinder and a second pilot solenoid valve along a second branch of the circuit connecting said cylinder to said reservoir; wherein said first and second solenoid valves can be opened on command to allow the fluid to be discharged from said cylinder to said reservoir when said platform is being lowered; wherein said platform is a single platform whose plan size is sufficient to support one motorized vehicle at a time, wherein both said solenoid valves (13, 15) are normally closed to maintain said platform at a predetermined height and to prevent inadvertent discharge or leakage of the fluid in the event of failure even of only one of said solenoid valves (13, 15), said first branch comprising a non-return valve placed inside said electric pump so that, in the event of technical failures, said platform remains locked in position, characterized by said hydraulic circuit having a third branch adapted to directly connect said reservoir to said cylinder near said lower end to create a negative pressure therein as said platform is being lowered, the arrangement being such that the fluid drawn from said reservoir is vaporized and the vapors are deposited on the inner walls of said cylinder, thereby lubricating it and increasing the safety of the device.