A power supply system comprising: a power source unit, an electricity distribution unit connected to the power source unit, a system load power supply unit connected to the electricity distribution unit, and a peripheral power supply unit connected to the electricity distribution unit, wherein the electricity distribution unit comprises: a power consumption prediction module and a power consumption control module, wherein the power consumption prediction module comprises: • a detection circuit configured to detect a system load current and a change rate of the system load current, wherein the system load current is used to reflect a system load power consumption; • a time generation circuit configured to generate a reference time; • a calculation circuit configured to calculate a predicted current that is after the reference time according to the system load current, the change rate of the system load current and the reference time, wherein the predicted current is used to reflect a variation trend of the system load power consumption; and the power consumption control module comprises: • a comparator circuit configured to set a reference current, and compare the predicted current with the reference current; • a control circuit configured to: when the predicted current is greater than the reference current, increase a power supply capacity of the system load power supply unit, and reduce a power supply capacity of the peripheral power supply unit; and when the predicted current is not greater than the reference current, reduce the power supply capacity of the system load power supply unit, and increase the power supply capacity of the peripheral power supply unit. a power consumption prediction module and a power consumption control module, wherein the power consumption prediction module comprises: • a detection circuit configured to detect a system load current and a change rate of the system load current, wherein the system load current is used to reflect a system load power consumption; • a time generation circuit configured to generate a reference time; • a calculation circuit configured to calculate a predicted current that is after the reference time according to the system load current, the change rate of the system load current and the reference time, wherein the predicted current is used to reflect a variation trend of the system load power consumption; and • a detection circuit configured to detect a system load current and a change rate of the system load current, wherein the system load current is used to reflect a system load power consumption; • a time generation circuit configured to generate a reference time; • a calculation circuit configured to calculate a predicted current that is after the reference time according to the system load current, the change rate of the system load current and the reference time, wherein the predicted current is used to reflect a variation trend of the system load power consumption; and the power consumption control module comprises: • a comparator circuit configured to set a reference current, and compare the predicted current with the reference current; • a control circuit configured to: when the predicted current is greater than the reference current, increase a power supply capacity of the system load power supply unit, and reduce a power supply capacity of the peripheral power supply unit; and when the predicted current is not greater than the reference current, reduce the power supply capacity of the system load power supply unit, and increase the power supply capacity of the peripheral power supply unit. • a comparator circuit configured to set a reference current, and compare the predicted current with the reference current; • a control circuit configured to: when the predicted current is greater than the reference current, increase a power supply capacity of the system load power supply unit, and reduce a power supply capacity of the peripheral power supply unit; and when the predicted current is not greater than the reference current, reduce the power supply capacity of the system load power supply unit, and increase the power supply capacity of the peripheral power supply unit.