An Adaptive Voltage Scaling (AVS) system, method and apparatus, and a device. The system includes at least two controllers, a switching module, and a control object. The switching module is connected to the controllers through a bus, an output end of the switching module is connected to an input end of the control object, and the switching module scales the control object through AVS; and the switching module scales the occupied state of the bus through a selected controller, whereby the selected controller scales the control object through the bus.