The invention relates to a device and the method for determining vehicle stopping days automatically. The device comprises an MCU, an EEPROM, a display, a keyboard, a perpetual calendar IC, a voice IC and a loudspeaker, wherein, the EEPROM, the display, the keyboard, the perpetual calendar IC and the voice IC are connected with the MCU; and the output signal of the voice IC is connected with the loudspeaker. The method comprises the following steps: firstly, setting data, stopping starting time, stopping regulation, cycle period and license plate tail number; secondly, automatically adjusting the stopping regulation; and thirdly, comparing whether the automobile license plate tail number corresponds to the stopping license plate tail number according to the stopping regulation or not, so as to prompt whether the automobile can run on a road or not. The method has the advantages of simple structure, low cost, convenient and flexible installation, wide application and the like; by setting simply, the device can complete the automatic decision on vehicle stopping days, effectively avoid vehicle violation running, and ensure the implement of traffic rules; and meanwhile, the device also can be applied to other automobile products.