A motorization kit for a storage system with mobile cabinets comprises a box-like body for fixing the motorization kit to a mobile cabinet, which houses: an electric motor, a driven pinion designed to be keyed to the drive shank of the mobile cabinet, mechanical drive for kinematically rotatably connecting the shaft of the electric motor and the driven pinion, electronic adjustment and control for managing the operation of the motor, an actuation mechanism for providing an enable signal to the electronic adjustment and control, for rotary actuation of the motor and a safety mechanism for stopping the motor in response to a signal emitted as an obstacle is found along the path of the mobile cabinet.