The carbon filter is made by heating and sintering activated carbon particles with a binder. The innermost layer of the filter element is a polypropylene skeleton to enhance the pressure resistance of the filter element. The bone frame is covered with two layers of polypropylene microfiber felt, which can intercept liquid passing through the carbon core and bring out particles larger than 10 microns. The outer layer of the carbon core is covered with two layers of polypropylene superfine fiber felt, which can intercept particles larger than 10-20 microns in the liquid, so that the filter element has the dual functions of filtration and purification. The outermost layer is a white plastic mesh sleeve, which gives the filter element a complete and neat appearance. Both ends of the filter element are equipped with soft nitrile rubber end caps, so that the filter element has a good sealing performance after being installed in the filter cartridge. The finished activated carbon filter element is tightly encapsulated with plastic film to prevent the water treatment filter element from being polluted and keep the filter element in a fresh state. The activated carbon filter element has a good adsorption effect and can effectively remove residual chlorine, peculiar smell, color and organic matter in the water.