The invention relates to a method for preparing a rhodomyrtus tomentosa particle instant solid beverage based on a superfine grinding technology. The method comprises the following production steps: firstly, selecting and cleaning a fruit, washing the rhodomyrtus tomentosa fruit by using clean water, and draining; secondly, drying, namely, drying the rhodomyrtus tomentosa fruit in a blast drying oven, and transferring the dried rhodomyrtus tomentosa fruit to a vacuum drying box for drying continuously; thirdly, grinding, namely, performing primary grinding on the rhodomyrtus tomentosa fruit to obtain coarse powder, and performing superfine grinding on the coarse powder to obtain superfine whole fruit powder; fourthly, blending and uniformly mixing main and auxiliary materials of rhodomyrtus tomentosa particles; fifthly, preparing a soft material and granulating through the prepared mixed material; sixthly, drying again, namely, tiling prepared wet particles on a baking tray for drying; finally, sizing by adopting a 20-40-mesh screen to obtain a rhodomyrtus tomentosa particle solid beverage product. The rhodomyrtus tomentosa particle instant solid beverage has the characteristics of convenience in preparing, safety, hygiene, convenience in storage and transport, and the like.