The invention discloses a commercial vehicle loading and unloading engineering vehicle of a special vehicle for wagon double-layer transporting cars. The commercial vehicle loading and unloading engineering vehicle comprises a downward-concave truck chassis, hydraulic landing legs, a rotary table base, a hydraulic transmission mechanism and a pulling type slope. The hydraulic landing legs are installed on the two sides of the downward-concave truck chassis, the rotary table base is installed on the downward-concave truck chassis, the hydraulic transmission mechanism is installed on the rotary table base, the pulling type slope is installed on the hydraulic transmission mechanism, and the rotary table base drives the hydraulic transmission mechanism and the pulling type slope to integrally rotate by a certain angle. A plurality of fixing fulcrums are fixed to the upper surface of the rotary table base so that a hydraulic cylinder of the hydraulic transmission mechanism and one end of a rotating arm can be fixed. A certain number of limiting gears are fixed to the upper surface of the rotary table base so that the rotating arm can be supported and the falling position of the rotating arm can be limited. According to the commercial vehicle loading and unloading engineering vehicle, a universal truck serves as the chassis, the multi-level pulling type slope is arranged, the commercial vehicle loading and unloading slope pavement is automatically finished through a series of mechanical actions, the manual cost is saved, the labor intensity is reduced, and the working efficiency and the commodity safety are improved.