The presently disclosed subject matter is directed to a system and method of extracting bioactive agents from biomass using continuous microwave-assisted extraction. The disclosed system comprises a plurality of microwave modules that exposes the biomass to continuous microwave energy, and an extraction module to extract bioactive agents from the biomass. In some embodiments, the biomass is exposed to subcritical water treatment in the microwave modules. The disclosed system enables bioactive agent to be extracted effectively, in a relatively short period of time compared to conventional extraction methods and allows for an enhanced extraction yield.