Spread spectrum clock generating circuit with power-saving control

The invention provides a clock spread spectrum generating circuit with power-saving control, which is used for carrying out spread spectrum on the input clock signals into output clock signals. The spread spectrum clock generating circuit comprises a clock delay chain module, a clock selection and output unit and a control unit, wherein the clock delay chain module comprises a plurality of clock delay chains and is used for generating a plurality of delay clock signals; the control unit can generate a plurality of counter signals according to the output clock signals and can generate a plurality of power-saving control signals according to the counter signals; the clock selection and output unit is used for selectively combining the delay clock signals to generate output clock signals according to the counter signals; and the clock delay chain module is used for selectively starting the clock delay chains according to the power-saving control signals, therefore, spread spectrum output clock signals can be eff