A balancing apparatus for a transition coupler is arranged on the upper end face of the transition coupler(1). The balancing apparatus comprises a rotating shaft (2) arranged on the transition coupler(1), a rotating rod(4) and a top seat(7). The rotating rod(4) comprises an upper end plate(11) and a lower end plate(12), a ramp protrusion(13) is arranged between the upper end plate(11) and the lower end plate(12) the ramp protrusion(13) is located on the side face of the lower end plate(12), the ramp protrusion(13) is of a sheet protruding structure; when the upper end plate and the lower end plate of the rotating rod serve as the reference, in the longitudinal direction, the ramp protrusion(13) is of the structure that the ramp protrusion(13) outward inclines towards the rotating rod, one end of the rotating rod(4) is arranged on the rotating shaft, a pin shaft(5) is arranged at the other end of the rotating rod(4), an eyelet bolt(6) is further arranged on the pin shaft(5), and the rotating rod(4) can rotate around the rotating shaft(2) and hinged to the eyelet bolt(6) through the pin shaft(5). A through hole is formed in the top seat(7), the eyelet bolt(6) penetrates through the through hole in the top seat, a nut(9) is fixedly arranged at the tail end of the eyelet bolt(6), a spring(10) is arranged between the nut(9) and the through hole of the top seat(7), and the diameter of the spring(10) is larger than the diameter of the through hole in the top seat(7). The balancing apparatus can effectively prevent the phenomenon of a "bent head" found in a transition coupler when coupling car-couplers, and the transition coupler can be horizontal after being installed.