On the basis of the use of polyester needle felt sparse water repellents and oil by dipping, pre-drying, curing treatment at room temperature to form a dust cloth. After the hydrophobic agent and oil repellent agent by rapid drying, a mesh bag attached to the fiber surface which reduces the filter and oil and water filter itself tension, wet filter medium such as water, oil and dust formation is not will adhere to the surface of the bag, the bag in order to avoid the phenomenon of paste, water and oil repellent needle felt which can effectively prevent the adhesion of water and oil, so dust off easier.