A drum coating device for coating work-pieces includes a main body, a support element, a cleaning device, a spraying device, a rotary drum device, a heating device, and a drive device. The main body defines a receiving room. The support element is received in the receiving room and defines slots for receiving the work-pieces. The cleaning device cleans the work-pieces. The spraying device sprays coating materials to the work-pieces. The rotary drum device uniformly coats the coating materials on the work-pieces. The heating device heats the coating materials coated on the work-pieces. The drive device includes a rotating drive rotating the support element and a linear drive raising or lowering the support element in the receiving room.