The invention discloses a 
tilmicosin smell masking preparation and a preparing method thereof, and belongs to the field of antibiotic preparations for 
livestock. According to the smell masking preparation, 
tilmicosin and gastric 
solubility high polymer materials serve as raw materials; and the smell masking preparation is prepared through the steps of fusion through an extruding 
machine, shearing and conveying. Compared with the prior art, 
digestion of the 
tilmicosin smell masking preparation in artificial 
saliva is slow, so that the effect of stopping releasing of the 
medicine in the 
oral cavity is achieved; contact between the 
medicine and the 
taste bud of the tongue is less, so that the bitter and hemp tastes can be obviously reduced, and the masking effect is achieved; and the 
medicine is rapidly released in a 0.01 mol / L 
hydrochloric acid solution (simulated 
gastric fluid), and the medicine keeps to play the medicine effect. In addition, the tilmicosin smell masking preparation is prepared with the hot melting 
extrusion technology, the technology is advanced, the process is simple, organic solvents are not used, and therefore the tilmicosin smell masking preparation is safe and free of 
pollution; mixing is carried out without a dead corner, the dispersion effect is good, and the medicine losses are fewer; and operation of multiple units is integrated together, so that space is saved, the cost is reduced, and the tilmicosin smell masking preparation is suitable for industrial large-scale production.