The invention relates to a preparation method of forest edible plant pickle and biomass detergent of the forest edible plant pickle. The forest edible plant pickle and the biomass detergent of the forest edible plant pickle are prepared from a forest edible plant as a raw material according to a pickle processing process. The forest edible plant pickle can be eaten and the pickle liquid can be used for preparing the forest green biomass detergent. The forest green biomass detergent is mainly used for washing and cleaning tableware under environment-friendly condition, has good effect of cleaning oil stains, and is pure natural, non-toxic, safe and environment-friendly.