Combined ball mill

The utility model discloses a combined ball mill which comprises a rack, a first ball-milling cylinder, a second ball-milling cylinder and a fixing plate, first bearings are installed at the two ends of the top of the rack, the first ball-milling cylinder is installed in the first bearings, the fixing plate is installed at one end of the top of the rack, and the second ball-milling cylinder is installed in the fixing plate. A second ball-milling cylinder is mounted at the top of one end, close to the rack, of the fixing plate, and a second bearing is mounted at the top of one end, away from the second ball-milling cylinder, of the fixing plate. According to the dry type ball mill, the shunt pipe, the drying pipe, the electric heating wire, the air outlet pipe and the air outlet are installed, when materials are subjected to dry type ball milling, air can be sucked in through the sucking pump and heated through the electric heating wire, and the heated air can be evenly blown out through the drying air pipe, s