The invention provides a fermented tea particle food prepared from green tea processing by-products and a preparation method of the fermented tea particle food. The preparation method comprises the following steps of by-product collection, by-product treatment, first-time modulation, fermentation, drying and puffing, second-time modulation, third-time modulation and drying. According to the method disclosed by the invention, all byproducts in green tea processing are fully utilized, the byproducts are classified, processed and used according to the nutrition and processing characteristics of different byproducts such as tea flakes, tea dust, tea stems and broken tea, and the utilization values of different byproducts are fully exerted by combining fermentation, dry puffing and multiple blending, so that high-valued fermented tea particles can be prepared; the prepared fermented tea particles are good in sensory form, unique in flavor and high in consumer acceptability, can be used as instant leisure food, can be drunk as tea for brewing, are suitable for people of various ages and levels, and have good market popularization value.