Air filters are mainly used in the fields of pneumatic machinery, internal combustion machinery, etc. Their function is to provide clean air for these mechanical equipment to prevent them from inhaling air with impurity particles during operation, which increases the probability of abrasion and damage. The main components of an air filter are the filter element and the casing. The filter element is the main filtering part, responsible for filtering gas, while the casing is the external structure that provides necessary protection for the filter element. The working requirements of an air filter are to be able to perform high-efficiency air filtration work, without adding too much resistance to air flow, and to be able to work continuously for a long time. [1] The engine needs to suck in a large amount of air during operation. If the air is not filtered, the suspended dust in the air will be sucked into the cylinder, which will accelerate the wear of the piston group and cylinder. Larger particles entering between the piston and cylinder can cause serious "cylinder pulling" phenomenon, which is particularly severe in dry and sandy working environments. The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand particles in the air, ensuring sufficient and clean air enters the cylinder. Among the thousands of components in a car, the air filter is a very inconspicuous part because it is not directly related to the technical performance of the car. However, in actual use of the car, the air filter has a great impact on the service life of the car (especially the engine). On the one hand, without the filtering effect of an air filter, the engine will inhale a large amount of air containing dust and particles, resulting in severe cylinder wear; On the other hand, if the air filter is not maintained for a long time during use, the filter element of the air filter will be covered with dust in the air, which not only reduces the filtering ability, but also hinders the circulation of air, resulting in excessive mixture and abnormal engine operation. Therefore, regular maintenance of the air filter is crucial.