Redundant power supply system providing alternate standby

A redundant power supply system providing alternate standby, comprising:

• at least one primary power supply which includes a first boot up state to receive a first power ON/OFF signal to transform an external power and output a primary duty power and a first standby state to stop transformation of the external power;
• at least one secondary power supply which includes a second boot up state to receive a second power ON/OFF signal to transform the external power and output a secondary duty power and a second standby state to stop transformation of the external power;
• and
• a power integration panel which is electrically connected to the primary power supply and the secondary power supply, and includes an energy-saving control loop to receive a power ON/OFF signal from a motherboard and perform simulation to generate the first power ON/OFF signal or the second power ON/OFF signal, and also includes a standby mode to receive the power ON/OFF signal from the motherboard and output at a selected time interval the first power ON/OFF signal to the primary power supply or the second power ON/OFF signal to the secondary power supply to make the primary power supply and the secondary power supply on standby alternately.