Abstract: A server system, a server device and a power management method for the server device are provided. The server system includes a first server device, at least one second server device and a power supply. The first server device obtains current power consumption information respectively transmitted by the second server device to calculate a current total power consumption value of the server system. The first server device determines whether it is necessary to raise a first preset power consumption upper limit to a second preset power consumption upper limit according to the current total power consumption value and an operation of the first server device, and determines whether the power supply has excess power according to the current total power consumption value and a total power consumption value of the power supply.