A connecting device between axes relates to the improvement of the connecting device between the axes. The invention provides the connecting device between the axes, which can cause the size of the axial direction to be smaller and prolong the service life of the axes. The connecting device comprises two symmetrical half hitch bars, which has the structure key points that the half hitch bars are provided with a gland bush which can be fixed at the end of the axes; the gland bush is externally provided with a shaft housing of an internal spline which is provided with an external tooth and can be meshed with a spline shaft; the external tooth of the shaft housing is meshed with the internal tooth of an outer ring; a block rubber is arranged between the internal tooth of the outer ring and the external tooth of the shaft housing; and a bolt is used for fixing the outer ring and the inner ring.