Abstract: A water-purifying filter has a tubular body portion being entirely coated with a polypropylene coating portion during a manufacturing process thereof. The polypropylene coating portion includes a first coating layer bonded to an inner circumferential surface of the tubular body portion when the first coating layer is still viscid, and a second coating layer sprayed onto an outer circumferential surface and two annular end surfaces of the tubular body portion to connect to two ends of the first coating layer. Two ends of the tubular body portion that has been coated by the polypropylene coating portion are sprayed with a waterproof material to form two watertight layers thereat to ensure water to pass both the tubular body portion and the polypropylene coating portion and be filtered and purified twice. The water-purifying filter with such structure does not need costs for storing and assembling separate polypropylene coating and end caps and can therefore be provided at lower cost.