The invention provides a preparation method of a high-
solubility plant polyphenol solid beverage. The preparation method comprises the following steps of (1) enabling zein to dissolve in an 
ethanol water solution, performing stirring for 30-60 minutes, adding 
plant polyphenols, and continuing performing stirring until the solution is completely clear to obtain mixed liquid I; (2) enabling 
sodium caseinate or 
gelatin to dissolve in water at 80 DEG C, performing stirring for 30 minutes, performing cooling to 
room temperature to obtain a 
sodium caseinate solution or a gelatine solution, dispersing the mixed liquid I in the 
sodium caseinate solution or the gelatine solution, performing 
evaporation to remove 
ethanol, adding water until the volume before 
evaporation is obtained, and obtaining mixed liquid II; (3) heating natural 
polysaccharide to 80 DEG C, then performing stirring and dissolving for 30 minutes, adding 
cane sugar, 
maltodextrin, essence and water, performing stirring until a uniform-mixed state is obtained, and obtaining 
sugar liquid; and (4) uniformly mixing the mixed liquid II with the 
sugar liquid, and performing 
spray drying. The high-
solubility plant polyphenol solidbeverage can effectively increase the 
solubility of 
curcumin and 
resveratrol in water, so that the prepared 
solid beverage has good functions of resisting 
in vitro oxidation and the like.