In recent years, researchers have focused on natural antioxidants because they are good for human health. Most scientists believe that around two-thirds of the plants in the world have medicinal value and good antioxidant activity. The goal of this work was to estimate antioxidant activities of plant extracts, collected from Chattogram Hill Tracts, Chattogram. Different types of Plant leaves were extracted with different solvents like water, ethanol, methanol, and Pet ether. These extracts were then tested to see if they have any antioxidant properties using a method called DPPH radical scavenging. The present study found that all plant extracts exhibited remarkable antioxidant activity among them water extract of plants had the highest level of antioxidants followed by ethanol followed by methanol then Petroleum ether extracts. The high antioxidant activity of these might be due to the presence of hydroxyl groups containing substance in polar solvent extract and these hydroxyl groups can damage free radicals and possess the necessary resources for radical scavenging. This study confirms that many plant extracts have very strong antioxidant activity, which can help treat diseases caused by free radicals in the body.