The filter element separates solid particles from liquids or gases, or allows different substance components to fully contact and accelerate reaction time, which can protect the normal operation of equipment or clean air. When the fluid enters the filter element with a certain specification filter, its impurities are blocked, and the clean fluid flows out through the filter element. The liquid filter element cleans the contaminated liquid (including oil, water, etc.) to the required state for production and daily life, that is, to achieve a certain degree of cleanliness.