A server rack system includes a rack, a rack management module, a plurality of servers, a management network connection module and a power module. The rack management module is located in the rack and coupled to a management network line. The servers are located in the rack and respectively have a baseboard management controller (BMC), in which each of the BMCs is used for monitoring a working state of the server where the BMC resides. The power module provides a working voltage required by the rack management module, the management network connection module and the servers. The rack management module obtains overall power consumption information through the power module, and obtains power consumption information of each of the servers through the management network line, and is used for managing the servers according to the overall power consumption information and the power consumption information of each of the servers.