The invention relates to a solid beverage, in particular to a longan sea-buckthorn solid beverage and a preparation method thereof. The invention provides a longan sea-buckthorn solid beverage and a preparation method thereof. The longan sea-buckthorn solid beverage comprises the following raw materials in mass percentage: 8%-12% of sea-buckthorn, 3%-4% of medlar, 2%-3% of Chinese date, 1%-2% of mulberry and the balance of longan pulp. The method for preparing the longan sea-buckthorn solid beverage comprises the following steps: pre-processing the raw materials, adding water into the pre-processed raw materials to soak and extract at least once to obtain combined extract liquid; filtering the combined extract liquid, taking supernate and carrying out vacuum concentration to obtain thick paste; adding sugar in the thick paste, preparing into particles, drying after fining the particles to obtain the longan sea-buckthorn solid beverage finally.