Test system and test method applied to digital output circuit

The embodiment of the invention provides a test system and a test method applied to a digital output circuit, which are applied to the technical field of rail transit. The system comprises an excitation voltage source, an analog-to-digital converter, a microcontroller and a communication interface, the excitation voltage source is used for providing excitation voltage for the digital output circuit; the analog-to-digital converter is used for collecting excitation voltage of the excitation voltage source as voltage input data of the digital output circuit; the output voltage of the digital output circuit is collected as voltage output data of the digital output circuit; the microcontroller is used for acquiring the working state of the digital output circuit through the communication interface; obtaining an input voltage and an output voltage of the digital output circuit according to the voltage input data and the voltage output data; whether the digital output circuit breaks down or not is accurately determ