The utility model relates to a safety check field. The utility model provides an on -vehicle safety inspection system that synthesizes includes: the carriage, X ray article security installations sets up in the carriage and is used for carrying out the X ray safety check to article, the human security installations of millimeter wave sets up in the carriage and is used for carrying out the millimeter wave safety check to the human body, and carriage loader constructs, set up in carriage department and is constructed into the messenger carriage to switch over between on -vehicle removals safety inspection mode and fixed place safety inspection mode, wherein, in on -vehicle removals safety inspection mode, the system can the carriage at the on -vehicle mobilizable circumstances under the execution to the X ray safety check of article and/or to the millimeter wave safety check of human body, and in fixed place safety inspection mode, the system can carry out under the carriage is in the circumstances in fixed place to the X ray safety check of article and/or to the millimeter wave safety check of human body.