The invention discloses a device for preparing superfine particles through supercritical fluid. A series of auxiliary valves in a device integrating body are selected to be controlled to be opened and closed, so that a series of device integrating body of device units for preparing superfine particles through supercritical fluid are formed, namely the functions of achieving the supercritical fluid extraction technology, the supercritical anti-solvent particle preparation technology, the supercritical solution quick-expansion particle preparation technology, the supercritical fluid enhanced solution diffusion technology and the supercritical fluid auxiliary micro-cyst technology are achieved, and the requirements for material extraction, organic micron/nanometer material preparation, and inorganic micron/nanometer material preparation are met. The device has the advantages that operation is simple and convenient, the device experiment parameter adjustable range is wide, stability is high, and production efficiency is high. The device has great application potentiality in the field of material preparation, is especially suitable for experimental study of colleges and universities and scientific research institutions, and small sample making in factories, and saves a large amount of device purchasing fund for users.