The utility model discloses a hydraulic generator exciting arrangement, include field regulator, excitation power fairing, de -excitation and rotor overvoltage protection, play to encourage the device, field regulator includes control circuit board, connects control circuit board's first port and second port, and the back subrack is connected to the second port, and it has a plurality of functional module plug -in components to peg graft on the back subrack, and control circuit board is including measuring transformer, rectifier circuit, filter circuit, voltage comparater, the circuit of adjusting connected in order, excitation power fairing, de -excitation and rotor overvoltage protection, play to encourage the device and all be connected to on a plurality of functional module plug -in components of back subrack, excitation power fairing includes power component, radiator, cooler, rectifier, de -excitation and rotor overvoltage protection include field suppression switch, de -excitation resistance, rotor overvoltage protection device, it includes switch, isolation transformer, plays to encourage contactor, steering diode or rectifier bridge, current -limiting resistor to play to encourage the device.