The invention discloses a preparation method for effervescent tablets made from bamboo leaves and green tea, which comprises the following steps: a. the preparation of bamboo leaves extract powder; b. the preparation of green tea extract powder; c. blending and granulating; d. vacuum drying, tabletting and molding. The method crashes the bamboo leaves and the green tea into 30 to 50 Mum slurries in a micronization manner by cleaning and cell disruption; the bamboo leaves powder and the green tea powder are produced respectively by ethanol digestion, vacuum concentration, spray drying and vacuum nitrogen charge; the two powders are evenly mixed with sodium bicarbonate, potassium bicarbonate, acid additive, sweetener, maltodextrin, magnesium stearate, sucrose powder and ethanol solution; two-step granulation, vacuum drying, tabletting and molding are carried out, then the tablets are packaged by multiple tablets or single tablet. Compared with the tea adopting a normal compound preparation method, the method of the invention keeps more functional components of the bamboo leaves and the green tea and has good instantly soluble performance and absorbability and the drinking is very convenient.