The invention discloses a middle shaft vehicle transporter chassis split connecting device which comprises a first connecting plate, a second connecting plate and a third connecting plate. The first connecting plate and the second connecting plate are identical in structure. Both the first connecting plate and the second connecting plate are L-shaped plates. Each L-shaped plate comprises a side plate and a transverse plate. Fixed vertical plates are welded to one side of the first connecting plate and one side of the second connecting plate correspondingly and are perpendicular to the first connecting plate or the second connecting plate. The tops and the side faces of the first connecting plate and the second connecting plate are both provided with a plurality of first adjusting holes. The first connecting plate and the second connecting plate are fixedly connected with the third connecting plate through the first adjusting holes, bolts and nuts. The surface of the third connecting plate is provided with second adjusting holes which correspond to the first connecting plate and the second connecting plate in position. Installation holes are formed in the side face of the third connecting plate. The middle shaft vehicle transporter chassis split connecting device is simple in structure, easy to implement, good in mechanical performance, high in stability and reliability, and suitable for popularization.