The present study deals with the effect of using plastic waste on mechanical properties of concrete. The experimental work consists of adding manually formed serrated plastic fibers by ratios of (1%, 2% and 3%) of cement weight. Different lengths of fibers were used for each ratio with a constant width of 5 mm. It was noticed from laboratory tests that the addition of plastic fibers improves the compressive strength, tensile strength and modulus of rupture of concrete, by different ratios, about 20%, furthermore it could be a sufficient method to get rid of plastic waste.