The present invention discloses a system and method for detecting environment-induced disablement of ADAS. The system comprises a rainfall detector, a fog detector and a temperature/humidity detector respectively generating a rainfall value, a fog value, and a temperature/humidity value; a processor electrically connected with these detectors, using the rainfall value and fog value to generate a rainfall-fog value, using the fog value and temperature/humidity value to generate a snowfall value, using a fuzzy computation to process the rainfall-fog value and snowfall value to generate an output value, and emitting an alert signal if the output value exceeds a preset output value; and an automatic driver assistance device electrically connected with the processor, receiving the alert signal, and determining whether to stop automatic driving according to the alert signal. The present invention will alerts ADAS of the disablement lest ADAS execute wrong control actions.