System on chip and control method thereof

The embodiment of the invention discloses a system on chip and a control method thereof. The control method of the system-on-chip comprises: global phase-locked loop level closed-loop control, wherein the global phase-locked loop level closed-loop control comprises the steps that according to the working states of all first subsystems in an on-chip unit, the on-off states of the same upper-level phase-locked loops of all the first subsystems in the on-chip unit and/or the frequency of output signals of the same upper-level phase-locked loops are reversely controlled; the first subsystem-level closed-loop control that comprises the following steps: reversely controlling the on-off state of a power supply corresponding to the first subsystem according to the working state of the first subsystem; and module-level closed-loop control, which comprises the step of reversely controlling the switching state of a superior clock gate corresponding to the first function module and/or the frequency of an output signal of