The present invention discloses a vehicle inspection system. The vehicle inspection system comprises a portal frame for forming an inspection passage, the portal frame including a cabin for installing a ray source and two vertical support arms respectively telescopically arranged at both sides of the cabin to support the cabin. The vertical support arm is telescopic. When the vehicle inspection system is in transition, the two vertical support arms are controlled to retract so as to reduce the overall height of the vehicle inspection system to meet the transportation height requirement; and after reaching the work site, the two vertical support arms are controlled to extend so that the height of the inspection passage meets the inspection operation requirement. Therefore, the vehicle inspection system of the present invention can better meet the transportation height requirement.