Accordingly, with the benefits of high temperature with short time treatment, microwave irradiation has conquered novel extraction technology to volarize food wastes. Compared to other unconventional ways, microwave-assisted-extraction (MAE) is superior for its accordance with green solvents due to the mode of heating which based on the dielectric constant level of solvents. In this study, the extraction processes of bioactive compounds from waste parts of beetroot were accomplished using a home-use microwave oven. Aside from peel; stalk and flesh were utilized for extraction at three coded levels of process conditions (low, medium, and high) for comparison. Control samples were prepared at 70ºC for 1 h extraction time with 1:10 w/v solvent ratio. Spectrophotometric analysis was performed for approaching bioactive compounds existing in specific parts of the beetroot. Compared to the control, approximately 2.2 times of total betalains, phenolics, flavonoids, and the relevant antioxidants were scavenged at 800 W of microwave power together with 150 s of extraction period following the descending order: peel, flesh, and stalk. Our observation is a prove of the high extraction efficiency of green solvent since pure water solvent brought more amount of specific bioactive compounds than aqueous ethanol under the same studied process conditions.