The invention discloses a DIC technology-based automobile thin plate FLC curve determination device and method. The device comprises a material tester, a video camera, a computer and a bulging tester. The bulging tester comprises an upper base, a female die, a blank holder, a lower base and a puncher pin. The upper base is fixed to an installation platform of the material tester, the female die is connected to the lower surface of the upper base, the blank holder is installed on the upper surface of the lower base, the lower base is fixed to a lifting platform of the material tester and the puncher pin is installed on a hydraulic cylinder. The method comprises tightly clamping a test sample between the female die and the blank holder by the lifting platform, punching the test sample to produce cracks by the puncher pin under the action of the hydraulic cylinder, shooting a test sample mesh deformation process by the video camera, computing a limiting strain value by the computer through DIC software, changing the test sample until all limiting strain values of all the samples are obtained, and drawing a FLC curve of an automobile thin plate by connection of all the limiting strain value points. The device and method are convenient for operation, save time and labor, greatly improve a measurement precision and are convenient for observation and research of necking phenomenon.