The present invention provides a nanoparticle for control-release and method of manufacturing the same. The tiny particle comprises algae extracts and divalent metal ions, and forms a complex by cross-linking. The present invention is able to produce the control release particle that meets user’s needs by controlling cross-linking time. In addition, if a surfactant is added, the time for control release can be increased. Therefore, this is an unexpected result.本發明提供一種用於控制釋放之微小粒子及其製作方法,此微小粒子包含海草萃取物及二價金屬離子,且經由交聯反應而形成之錯合物。本發明可藉由控制交聯時間而製備出符合使用者需求之控制釋放粒子。此外,若添加界面活性劑,可增長控制釋放的時間,此為原先不可預期之效果。