The invention discloses a test device for a generator rotor winding turn-to-turn short-circuit fault monitoring device. The test device comprises an HMI human-machine interface module, a calculation module, two DA conversion modules, two signal amplification output modules and a power supply module. The invention further discloses a test method for the generator rotor winding turn-to-turn short-circuit fault monitoring device. The test method comprises the steps of: firstly, setting fixed value parameters of output waveforms; secondly, calculating simulated key phase signal data and detectioncoil voltage data; thirdly, transmitting a simulated key phase signal and a simulated detection coil voltage signal to a tested rotor winding turn-to-turn fault monitoring device after DA conversion and amplification; and finally, checking whether signal sampling, fault feature calculation and logical judgment results of the tested rotor winding turn-to-turn fault monitoring device are correct. The test device and the test method can generate voltage waveforms similar to voltage waveforms actually measured by means of a field detection coil, simulate normal waveforms and fault waveforms, can verify whether the signal sampling, fault feature calculation and logic judgment of the monitoring device are correct in advance before the installation of equipment.