The invention discloses a lifting slope rail connecting device which comprises wedge-shaped flat steel rails, channel steel and n-shaped steel plates.The n-shaped steel plates are arranged on TBM matched standard rails on the two sides.The two wedge-shaped flat steel rails are symmetrically arranged on the n-shaped steel plates, the two pieces of channel steel are arranged on the outer sides of two TBM single-line standard rails and welded to the n-shaped steel plates, and four limiting bolts are arranged in front of and behind the channel steel for limiting and fixing.An internal combustion marshalling locomotive can safely provide vertical transition lap joint for two single-line rails through an inverted arch trolley so that the situation that rail jumping accidents frequently happen to the internal combustion marshalling locomotive within the lifting slope section rail joint range can be avoided.