The invention belongs to the technical field of application of assembling accessory of a coating machine for tablet preparation and discloses an efficient spray gun structure for the coating machine. The efficient spray gun structure comprises a nozzle holder, a positioning sleeve, a nozzle, a first guide tube, a threaded joint ring, a material-guiding joint, a first connecting bush, a second guide tube, an auxiliary connecting sleeve, a third guide tube, a feed tube, a limit ring, a second connecting bush and a booster pipe. The efficient spray gun structure for the coating machine has the advantages that the efficient spray gun structure is reasonable in design, has excellent corrosion resistance, wear resistance, high-temperature resistance and the like as it is assembled by stainless steel parts, has long service life and stable working state, provides a guarantee to coating quality and efficiency of the prepared medicine, and solves the problem that conventional coating spray guns are inconvenient to assemble and maintain; besides, the efficient spray gun structure has excellent explosion prevention performance and high safety coefficient, is standard and safe in specifications, is attractive and practical and is convenient to wash.