Device for dynamically and automatically measuring external dimension of vehicle

The utility model relates to the field of measurement technology, in particular to a device for dynamically and automatically measuring external dimension of a vehicle. The device comprises a distance-measuring sensor group, a signal processing module, a computer data collecting system and a computer software processing module, wherein the distance-measuring sensor group comprises a height measuring sensor, a width measuring sensor and a length measuring sensor; the length measuring sensor comprises a laser scanning system b; and the laser scanning system b is arranged just above a detecting driveway. In the utility model, the length measuring sensor adopts the laser scanning system b which is arranged just above the detecting driveway, therefore, an infrared curtain sensor and a laser positioning switch which are used for measuring the length of the vehicle are saved, the installation is convenient, and the device is not affected when being used outdoors.