The invention discloses an effervescent beverage with fat-reducing function comprising main ingredients and auxiliary materials, wherein the main ingredients include (by weight portions) green apple essence 10-50, green tea extract 10-30, Hypericum perforatum extract 10-30, calcium gluconate 10-30, zinc gluconate 10-30, and ferrous fumarate 10-30, the auxiliary materials include (by weight ratio) lemon acid 5-20, sodium hydrogen carbonate 5-20, soluble starch 25-40, sweetener 3-8, flavoring agent 0.5-3, preservative agent 1-2. The preparing process consists of mixing main ingredients homogeneously, charging auxiliary materials, stirring homogeneously, moistening and granulating, sieving, charging disintegrating agent, lubricating agent, mixing homogenously, tabletting, dressing, checking and packaging.