The utility model discloses an automatic transformation-ratio simulation test device for an intelligent constant-voltage transformer (CVT), which comprises a main control module, a test circuit module, a transformation-ratio simulation test module, a communication module, a key module and a display module. The test circuit module, the transformation-ratio simulation test module, the communication module, the key module and the display module are connected with the main control module. The test circuit module is configured to conduct the conversion treatment on the test data of an external to-be-tested product, and then transmit the data to the main control module. The communication module is configured to transmit the test data of external host equipment to the main control module. The main control module is configured to invoke the transformation-ratio simulation test module to process the test data transmitted from the test circuit module/communication module according to the preset information of the key module, and then display the result to the outside through the display module. According to the technical scheme of the utility model, the automatic transformation-ratio simulation test device can be used for the simulation training on the power system, and can also be connected with simulation power equipment to simulate the testing process of the transformation-ratio test. Meanwhile, the device can be matched with the external host equipment to simulate the testing process of the transformation-ratio test and equipment failures.