LDB type high-efficiency coating machine adopts the principle of upper and lower layers of opposite double-helix stirring to eliminate tablet stagnation in the dead zone, so that the material can tumble in the coating pot and make reciprocating axial motion under the stirring action of the two layers of double helix. The synthesis of the above two kinds of motion makes the tablet core layer produce a three-dimensional flow trajectory, improves the flatness and smoothness of the coating, and has uniform weight gain and color difference, so that the overall coating quality is improved.