Preparation method of ginseng and caffeine craft beer

The invention provides a preparation method of ginseng and caffeine craft beer, and relates to the technical field of food beverages. The preparation method of the ginseng and caffeine craft beer comprises the following steps: S1, treatment of plant raw materials: weighing the plant raw materials according to the weight ratio, crushing, sieving with a 60-mesh sieve, and refluxing and extracting for 90 minutes by using 70% edible ethanol at the temperature of 45-55 DEG C and under the vacuum pressure of-0.07 MPa; and S3, mixing and preparation of the raw materials: adding a plant raw material extracting solution to participate in secondary fermentation after main fermentation, cooling and carrying out cold storage when the appearance sugar degree is reduced to 4.0 degree P, the fermentation degree reaches 64% and the diacetyl content is reduced to 0.07-0.08 mg/l, sealing a can when the appearance sugar degree reaches 4.2 degree P, naturally boosting the pressure to 0.09 Mpa. keeping the pressure constant, filt