The Portable Under-Vehicle Surveillance System integrates with vehicle bottom image acquisition, image Mosaic display automatic detection and light filling. The system can automatically detect the vehicle for inspection, intelligent light filling, and real-time scanning under vehicle through the HD camera, accurately and efficiently present the full picture of the vehicle, effectively assist the staff to check the hidden and damaged conditions under the vehicle, and prevent the hiding of chemical or biological dangerous goods, bombs, etc.. It is Applicable to customs, public security, traffic, airport, hotel and other entrance control places.