A vehicle-carrying and portable style ramp for inspection system of small vehicle comprises a connecting framework of a rectangle shaped and for limiting inner space, a first intermediate section and a second intermediate section parallel provided on two opposite sides of the connecting framework and comprising first to fourth ramp sections with substantial triangle shaped longitudinal cross-sections. The first ramp section and the second ramp section are respectively detachably connected to two opposite ends of the first intermediate section, and the third ramp section and the fourth ramp section are respectively detachably connected to two opposite ends of the second intermediate section. Heights of ramp tops of the first to the fourth ramp sections are substantially same with heights of the first intermediate section and the second intermediate section. The ramp device is arranged on a vehicle used as a portable device when in idle time. Testing vehicles are raised to certain height by an assembled ramp device when vehicles are in test, thereby making chassis and tires of existing small vehicles enter scan range to realize test of each portion of a small vehicle.