A mobile, vehicle-mounted scanning inspection system, comprising: a vehicle body having an inspection arm support to support an inspection arm, the inspection arm including a cross arm and a vertical arm to define an L-shape that is deployed in use to define an inspection tunnel in which an object to be inspected is placed; and a first inspection device to emit a first laser plane and a second inspection device to emit a second laser plane, provided on the cross arm; wherein: the first inspection device is arranged on the side proximate the vehicle body, a first laser inspection plane emitted from the first inspection device being parallel to the side plane of the vehicle body, and a length of the longest portion of the first laser inspection plane being longer than a length of the vehicle body; the second inspection device is provided on the side proximate the vertical arm, a second laser inspection plane emitted from the second inspection device is parallel to the side plane of the vehicle body, and the second laser inspection plane is centered on the vertical arm and extends a first preset distance (Lc) and a second preset distance (Ld) forward and backward; the system further comprises a controller coupled to the first inspection device and the second inspection device; the first inspection device and/or the second inspection device are configured to issue an alarm signal when the first inspection device and/or the second inspection device inspects an object exceeding a preset size placed between the first laser inspection plane and the second laser inspection plane during the scanning inspection process; and the controller is configured to stop the movement of the vehicle body when the alarm signal from the first inspection device and/or the second inspection device is received. a vehicle body having an inspection arm support to support an inspection arm, the inspection arm including a cross arm and a vertical arm to define an L-shape that is deployed in use to define an inspection tunnel in which an object to be inspected is placed; and a first inspection device to emit a first laser plane and a second inspection device to emit a second laser plane, provided on the cross arm; wherein: the first inspection device is arranged on the side proximate the vehicle body, a first laser inspection plane emitted from the first inspection device being parallel to the side plane of the vehicle body, and a length of the longest portion of the first laser inspection plane being longer than a length of the vehicle body; the second inspection device is provided on the side proximate the vertical arm, a second laser inspection plane emitted from the second inspection device is parallel to the side plane of the vehicle body, and the second laser inspection plane is centered on the vertical arm and extends a first preset distance (Lc) and a second preset distance (Ld) forward and backward; the system further comprises a controller coupled to the first inspection device and the second inspection device; the first inspection device and/or the second inspection device are configured to issue an alarm signal when the first inspection device and/or the second inspection device inspects an object exceeding a preset size placed between the first laser inspection plane and the second laser inspection plane during the scanning inspection process; and the controller is configured to stop the movement of the vehicle body when the alarm signal from the first inspection device and/or the second inspection device is received. the first inspection device is arranged on the side proximate the vehicle body, a first laser inspection plane emitted from the first inspection device being parallel to the side plane of the vehicle body, and a length of the longest portion of the first laser inspection plane being longer than a length of the vehicle body; the second inspection device is provided on the side proximate the vertical arm, a second laser inspection plane emitted from the second inspection device is parallel to the side plane of the vehicle body, and the second laser inspection plane is centered on the vertical arm and extends a first preset distance (Lc) and a second preset distance (Ld) forward and backward; the system further comprises a controller coupled to the first inspection device and the second inspection device; the first inspection device and/or the second inspection device are configured to issue an alarm signal when the first inspection device and/or the second inspection device inspects an object exceeding a preset size placed between the first laser inspection plane and the second laser inspection plane during the scanning inspection process; and the controller is configured to stop the movement of the vehicle body when the alarm signal from the first inspection device and/or the second inspection device is received.