Nuclear reactor DCS maintenance device and method

The invention discloses a nuclear reactor DCS maintenance device and method, and the device comprises a human-computer interface which is used for controlling a testing device cabinet to output or collect signals so as to carry out the automatic testing of a tested DCS, and automatically carrying out the fault diagnosis and performance prediction of the tested DCS through a fault diagnosis model and a performance prediction model which are constructed in advance; the test device cabinet internally comprises at least one case, and a main controller, an analog quantity output module, a switching value output module, an analog quantity input module and a switching value input module are installed in the case; the output module is used for providing a signal required by a test for the tested DCS; the input module is used for collecting signals processed and judged by the tested DCS. Based on an integrated testing device cabinet and in combination with an intelligent algorithm of the upper computer, automatic test