The invention discloses a round car tippler transmission device, and relates to the technical field of car tippler transmission. The round car tippler transmission device comprises a rotary drum and transmission structures, wherein each transmission structure is formed by a motor, a coupler, a speed reducer, another coupler and a driving roller wheel which are connected in sequence, a small gear on the driving roller wheel is meshed with a big gear on the rotary drum, and the transmission structures are respectively arranged at two ends of the rotary drum. The round car tippler transmission device overcomes the defects of too large shaft deflection, low operation stability, and short service life of a transmission shaft, improves work efficiency, and lowers cost.