A mobile back scattering imaging security inspection apparatus, comprising: a) a back scattering scanner configured to emit a ray beam for scanning an object to be inspected; b) a detector configured to receive a back scattering ray of the ray beam for scanning the object to be inspected; c) a controller configured to control the back scattering scanner so that the back scattering scanner emits the ray beam for scanning the object to be inspected; and d) a movable stage configured to carry the back scattering scanner, the detector and the controller and being movable with respect to the object to be inspected, wherein the detector comprises a plurality of detecting units arranged in a direction perpendicular to a movement direction of the movable stage; e) wherein the back scattering scanner comprises a distributed X-ray source and a collimator, f) the distributed X-ray source comprising a plurality of target points, each of which is configured to emit the ray beam individually, the ray beam emitted from each of the plurality of target points being collimated by the collimator into at least one pencil ray beam; and g) wherein the back scattering scanner, the detector and the controller perform an imaging security inspection operation on the object to be inspected during moving along with the movable stage with respect to the object; and further characterized by h) one or more distance measuring devices configured to measure in real-time a distance between a surface of the detector for receiving the back scattering ray and a ray incidence face of the object to be inspected; wherein i) the controller is configured to determine the target points, from which the pencil ray beams are simultaneously emitted, among the plurality of target points, on the basis of the distance measured by the distance measuring devices. a) a back scattering scanner configured to emit a ray beam for scanning an object to be inspected; b) a detector configured to receive a back scattering ray of the ray beam for scanning the object to be inspected; c) a controller configured to control the back scattering scanner so that the back scattering scanner emits the ray beam for scanning the object to be inspected; and d) a movable stage configured to carry the back scattering scanner, the detector and the controller and being movable with respect to the object to be inspected, wherein the detector comprises a plurality of detecting units arranged in a direction perpendicular to a movement direction of the movable stage; e) wherein the back scattering scanner comprises a distributed X-ray source and a collimator, f) the distributed X-ray source comprising a plurality of target points, each of which is configured to emit the ray beam individually, the ray beam emitted from each of the plurality of target points being collimated by the collimator into at least one pencil ray beam; and g) wherein the back scattering scanner, the detector and the controller perform an imaging security inspection operation on the object to be inspected during moving along with the movable stage with respect to the object; and further characterized by h) one or more distance measuring devices configured to measure in real-time a distance between a surface of the detector for receiving the back scattering ray and a ray incidence face of the object to be inspected; wherein i) the controller is configured to determine the target points, from which the pencil ray beams are simultaneously emitted, among the plurality of target points, on the basis of the distance measured by the distance measuring devices.