Free radicals are produced when biomolecules including proteins, lipids, carbohydrates, and nucleic acids oxidize. These radicals are the main cause of degenerative illnesses in living things. So, antioxidants scavenge these free radicals and shield cells from harm in order to reduce the oxidation of biomolecules. The goal of the current study was to investigate the phytochemical screening and free radical scavenging ability of a Hylocerous Undatus (peel) extract in vitro. A Soxhlet extractor was used to extract the ethanol from the peel of Hylocerous Undatus. The phytochemical components of Hylocerous Undatus were then displayed using phytochemical screening. The Fenton reaction was also used to calculate the overall antioxidant activity. Plant extract's antioxidant activity was tested using ascorbic acid, a common reducing agent. These results show that the extract from Hylocerous Undatus (peel) has both antioxidant and hydroxyl radical scavenging properties in an in vitro test system.