The application provides a communication record device test device and a communication record device test system. A control unit sends a first control instruction and a second control instruction. An LKJ simulation unit generates LKJ simulation information according to the first control instruction, and sends the LKJ simulation information to a tested communication record device. A running environment simulation unit generates detection information of other function detection units in a locomotive safety information comprehensive detection device according to the second control instruction, and sends the detection information to the tested communication record device. Further, the running environment simulation unit makes a comparative analysis of information returned by the tested communication record device, and gets test data according to the result of comparative analysis. The control unit analyzes the test data and dump data of the tested communication record device. When judging that the test data is consistent with the dump data, the control unit gets a detection result indicating that the communication function of the tested communication record device is normal, and sends the detection result to a display unit to display the detection result. Automatic test of the communication record device is realized, and the quality of the communication record device is guaranteed.