The invention relates to a dark green tea beverage for reducing fat and losing weight. The dark green tea beverage is prepared from the following raw material formulation in parts by weight: 18-20 parts of dark green tea, 4-6 parts of radix astragali, 4-6 parts of polygonatum kingianum, 3-5 parts of poria, 3-5 parts of folium mori, 3-5 parts of flos chrysanthemi, 2-4 parts of fructus hordei germinatus, 2-4 parts of fructus crataegi and 1-3 parts of radix glycyrrhizae; and the dark green tea is fresh tea leaves. According to the dark green tea beverage for reducing fat and losing weight, the dark green tea is taken as a basis to prepare the tea beverage, and matched with the traditional Chinese medicine components of 'homology of medicine and food', the radix astragali and the polygonatum kingianum have the effects of spleen fortifying, stomach mourishing and damp clearing, the poria, the folium mori, the flos chrysanthemi, the fructus hordei germinatus, the fructus crataegi and the radix glycyrrhizae are reasonably combined, the effects of digestion improvement and stomach invigorating, digestion improving, spleen invigorating and qi replenishing, damp clearing and diuresis promoting, irascibility inhibiting, heart calming and mind tranquilizing, sleep promoting, bowel relaxing and detoxicating, blocking relieving, metabolism improvement, body immune function enhancement are achieved, and the effects of reducing blood fat and losing weight are comprehensively achieved. The raw material full components are subjected to two times of fermentation of pile fermentation and ageing, the effective ingredients of all components are fully released, the tea beverage is prepared after decoction, the effects of reducing fat and losing weight are obvious, side effects are avoided, the taste is soft, the evaluation score is high, drinking is convenient, and the dark green tea beverage is suitable for various people to drink.