The invention discloses a lonicera caerulea and rubus idaeus composite beverage capable of eliminating dampness and invigorating stomach and a preparation method thereof. The lonicera caerulea and rubus idaeus composite beverage is prepared from the following raw materials in parts by weight: a lonicera caerulea, rubus idaeus, a traditional Chinese medicine extracting solution, beta-glucan, stachyose, stevioside and pure water, wherein the traditional Chinese medicine extracting solution is prepared from the following raw materials in parts by weight of huguenot fern herbs, anderson ironweed stems and roots, Yunnan hydrangea, common selfheal fruit-spike, siegesbeckia herbs, trapa incisa, fructus forsythiae, adenophora trachelioides, ligusticum wallichii, roots of herbaceous peonies, nude pronephrium rhizomes, radix solani melongenae, folium pyrrosiae, sarcopyramis nepalensis, gordon euryale seeds, common clubmoss herbs, oriental arborvitae, dioscorea nipponica, longstamen onion bulbs,origanum, amplexicaul jasmine leaves and pummelo peel. The preparation method comprises the following working procedures of performing careful selecting, performing cleaning, performing crushing, performing cooling, performing enzymolysis, performing fermentation, performing alcohol reducing, performing filtering, extracting traditional Chinese medicine liquid, preparing clear juice, performing mixing, performing sterilizing, performing filling, performing labelling, and performing packing in a box. The preparation method is scientific in formula and particular in medication, and the compositebeverage has the efficacy of quickly clearing away heat, eliminating dampness, invigorating the stomach and promoting digestion, takes effect quickly, and is free from toxic and side effects.