The invention discloses polyamide porous microspheres and a preparation method thereof. The preparation method comprises the preparation steps: heating and dissolving polyamide into a good solvent of the polyamide by a dissolution-precipitation mode; adding a poor solvent of the polyamide, which contains a dispersing agent PVP, and performing precipitation and aftertreatment to obtain the polyamide porous microspheres with high dispersibility. The preparation method does not need high-temperature high-pressure equipment, and the process is simple, convenient, economic, effective, environment-friendly and easy to implement. The used solvents are low in boiling point and insusceptible to remain, and the solvents and the dispersing agent can be recycled. The polyamide porous microspheres prepared with the method is narrow in size distribution, and fine particles with small particle size can be obtained; furthermore, the particle size can be adjusted along with the change of the preparation conditions such as the ratio of the good solvent to the poor solvent and the PVP content.