The utility model relates to a connecting device used in vehicles, in particular to a cross type universal joint connecting device which overcomes the deficiency that the connecting device of the prior output shaft of gear box and the input shaft of wheel retarder is easy to vibrate causing the damage of the workpiece in the vehicle, high energy consuming and big noise. The utility model comprises a driving axle and a cross type universal joint; wherein, the output shaft of gear box and the input shaft of wheel retarder respectively connect with the cross type universal joint in the driving axle. The connecting device guarantees that the instantaneous angular velocity of the output shaft equals to instantaneous angular velocity of the input shaft, which improves the longevity of the vehicle workpiece, makes the adjustments conveniently in use, and reduces the cost, the energy consuming and the noise pollution greatly.