Method and device for preparing low-melting-point polymer microspheres

The invention relates to a low-melting-point polymer microsphere preparation method and device, and belongs to the field of polymer microsphere preparation. The preparation method comprises the following steps: dispersing low-melting-point macromolecules in hot water containing an emulsifier in a molten liquid drop form under a stirring condition, and pre-emulsifying to obtain pre-emulsified liquid; pressing the hot pre-emulsification liquid into a porous membrane by adopting set pressure, and obtaining microsphere emulsion with uniform particle size after set membrane passing times; and rapidly cooling the microsphere emulsion to a temperature below a polymer melting point, carrying out solid-liquid separation, removing supernatant to obtain cured microspheres, and then washing and drying to obtain the polymer microspheres with uniform particle sizes. Compared with the prior art, the preparation method of the microspheres does not need an organic solvent, so that pollution is reduced; the particle size and d