The invention relates to a 
cassia seed 
solid drink and a preparation method thereof, belonging to the technical field of foods. The 
cassia seed 
solid drink comprises the following raw materials in parts by weight: 15-20 parts of 
cassia seed, 10-20 parts of 
coix seed, 15-20 parts of red dates, 5-10 parts of hawthorns, 5-10 parts of peanuts and 3-8 parts of wolfberry, and is prepared by the steps of pretreating, crushing, mixing, decocting, concentrating and 
drying. The medicines with homology of 
medicine and food are taken as raw materials, the cassia seed 
solid drink does not contain any additive, the components in the raw materials have efficient synergism and complement each other, the product with higher content of functional components can be obtained by enriching the multiple effective components, and the effects of improving the 
immunity and resisting aging can be achieved. The raw materials are respectively treated by a 
superfine grinding technology, are then treated by 
spray drying, and the like, so that the cassia seed solid drink which is bright in color, faint scent in 
flavor, fine and smooth in mouth feel, good in 
brewing dissolubility and convenient to drink can be obtained.