A vehicle-carried quick inspection system , comprising: a carrying vehicle , a foldable arm mount provided on the carrying vehicle and configured to be folded onto or within the carrying vehicle in a transportation state and to be unfolded to stride over an inspected vehicle in a working state so as to form an inspection passage through which the inspected vehicle passes during inspection; an X-ray source capable of providing an adjustable radiation dose, provided on the carrying vehicle and configured to radiate X-rays of a desired dose to irradiate the inspected vehicle ; a detector provided on the foldable arm mount and configured to be located at a position opposite to the X-ray source and to receive information about X-rays passing through the inspected vehicle in the working state, in which the X-ray source and the detector are arranged on opposite sides of the inspection passage for the inspected vehicle and the inspected vehicle passes through the inspection passage ; and a controller configured to control the X-ray source to irradiate different portions of the inspected vehicle with different doses, characterized in that the vehicle-carried quick inspection system further comprises an additional mount and photosensors mounted on the additional mount , the photosensors being configured to transmit signals to the controller when a head portion of the inspected vehicle passes the additional mount in a direction from the head portion to a tail portion of the carrying vehicle , so that the controller actuates the X-ray source to increase radiation dose, thereby the vehicle-carried quick inspection system enters into a high dose inspection state, wherein the additional mount is located at a position downstream of the X-ray source in the direction from the head portion to the tail portion of the carrying vehicle . a carrying vehicle , a foldable arm mount provided on the carrying vehicle and configured to be folded onto or within the carrying vehicle in a transportation state and to be unfolded to stride over an inspected vehicle in a working state so as to form an inspection passage through which the inspected vehicle passes during inspection; an X-ray source capable of providing an adjustable radiation dose, provided on the carrying vehicle and configured to radiate X-rays of a desired dose to irradiate the inspected vehicle ; a detector provided on the foldable arm mount and configured to be located at a position opposite to the X-ray source and to receive information about X-rays passing through the inspected vehicle in the working state, in which the X-ray source and the detector are arranged on opposite sides of the inspection passage for the inspected vehicle and the inspected vehicle passes through the inspection passage ; and a controller configured to control the X-ray source to irradiate different portions of the inspected vehicle with different doses, characterized in that the vehicle-carried quick inspection system further comprises an additional mount and photosensors mounted on the additional mount , the photosensors being configured to transmit signals to the controller when a head portion of the inspected vehicle passes the additional mount in a direction from the head portion to a tail portion of the carrying vehicle , so that the controller actuates the X-ray source to increase radiation dose, thereby the vehicle-carried quick inspection system enters into a high dose inspection state, wherein the additional mount is located at a position downstream of the X-ray source in the direction from the head portion to the tail portion of the carrying vehicle . <EOS>