A controller initializing device and method is configured to initialize controllers. When a device is powered on, a basic input and output system of the device initializes a first chip of the device. The basic input and output system starts a power on self test and initializes a first controller of the device. The basic input and output system outputs a trigger signal when the power on self test of the basic input and output system ends. A baseboard management controller of the device accesses the first controller when the baseboard management receives the trigger signal.