An inkjet coating device comprises a support board and a sprinkler head. The support board is provided for placing the glass plate, the sprinkler head comprises a plurality of spray nozzles, wherein, the spray nozzles comprise an ink entrance port and an ink exit port, the ink is poured from the ink entrance port and poured onto the glass plate from the ink exit port, the internal diameter of the ink entrance port is larger than that of the ink exit port. The inkjet coating device comprises a trumpet-shaped spray nozzle which are closed together without gap, so as to not only increase the spraying capacity, but also make the trumpet-shaped ink drop more disperse in each coating interval belt uniformly to form an ink coating layers with uniform thickness.