<p>To ensure the reliability of measurement results from radioactive aerosol monitors, it is necessary to study the preparation technology for radioactive aerosol filter membrane standard source. In this work, a preparation system for radioactive aerosol filter membrane standard sources was developed, consisting of a radioactive aerosol generation unit, a radioactive aerosol sample preparation unit, an aerosol particle size measurement unit, and an exhaust gas treatment unit. Using this system, ²⁴¹Am filter membrane sources of different activities were prepared. Test results show that the relative error of the prepared ²⁴¹Am filter membrane sources, when measured by different instruments, is ≤ 5%.s</p>