The invention discloses a floating conveying assembling vehicle which comprises a lifter, a universal ball platform and a workbench placed on the universal ball platform. The universal ball platform is arranged on the upper portion of the lifter in a supporting mode through a spring support. During assembling, a workpiece is placed on the workbench, the workbench is placed on a universal ball of the universal ball platform so that the workpiece can be easily pushed to move freely in the horizontal plane, meanwhile, due to the fact that the universal ball platform is arranged on the spring support, the gravity of the workpiece and the gravity of the universal ball platform are balanced through a spring, an assembling operator can adjust the position of the workpiece in a fine mode easily in the up-down direction, accordingly, the assembling position of the workpiece can be easily adjusted through the assembling vehicle, quick assembling is achieved, assembling working efficiency is improved, labor is saved during assembling operation, labor intensity is low, a track is arranged, long-distance conveying and alignment assembling integrated automatic working can be achieved, the automatic degree is high, and meanwhile the floating conveying assembling vehicle has the advantages of being simple in structure, convenient to maintain and the like.