The utility model discloses a five-free-direction articulated steering device belonging to a connection steering device, which aims to provide a steering connection device used for a crawler type double-body all-terrain vehicle. The five-free-direction articulated steering device comprises front and rear reaming bases respectively fixed on a front vehicle and a rear vehicle, and a steering unit connected between the front reaming base and the rear reaming base. The steering unit comprises a front connection mechanism (2) hinged to the front reaming base (1), a front balance cylinder (6) hinged to the front connection mechanism, a rear connection mechanism (3) hinged to the front connection mechanism, a rotary sleeve (4) hinged to both the rear reaming base (5) and the rear connection mechanism, a rear balance cylinder (8) hinged to the rotary sleeve, and two steering cylinders (7) hinged to the left and right sides of the rear connection mechanism (3). The piston rods of the two steering cylinders are respectively hinged to the front connection mechanism (2). Due to the arrangement of the five-free-direction articulated steering device, the flexible maneuverability and the powerful obstacle navigation capability of vehicles are ensured. Meanwhile, the excellent running stability and the comfortableness of vehicles are also ensured.