The invention relates to a method for preparing a three-component phononic 
crystal by using scattering objects. The method comprises the following steps: orderly arranging and uniformly 
coating the scattering objects in substrates, wherein the substrates are 
epoxy resins in different mixture ratios; the process of 
coating is implemented by using a molding mold, wherein the molding mold consists of an upper molding plate (1), a lower molding plate a (3) and a lower molding plate b (5); scrubbing the scattering objects by using 
acetone and arranging the scrubbed scattering objects in a semispherical hole (4) of the lower molding plate a; covering the upper molding plate at the upper end of the lower molding plate a; 
casting the 
epoxy resins from which air bubbles are removed into the lower molding plate a from a 
casting hole (2) of the upper molding plate (2); solidifying the scattering objects in a baking oven at the temperature of between 30 and 100 DEG C for 24 hours; turning the scattering objects coated and solidified by the 
epoxy resins for 180 degrees and placing the turned scattering objects into a concave volume of the lower molding plate b; and 
casting the epoxy resins onto the other sides of the scattering objects and solidifying the scattering objects in the baking oven at the temperature of between 30 and 100 DEG C for 24 hours to obtain the three-component phononic 
crystal. The three-component phononic 
crystal has the characteristics of stable performance, uniform interface, strong designability and the like.