The fully automatic self-cleaning filter automatically filters and removes impurities and dirt in the water under certain conditions without manual operation. With the energy inside the filter, automatic filtration, automatic cleaning, and automatic sewage discharge can be implemented. It also has fewer faults, high filtration accuracy, and long service life. It uses a smaller suction nozzle area to generate larger suction power to clean the filter. The modified single-layer high water permeability filter has good water permeability and fiber objects are not easily entangled in the filter. The self-cleaning filter is suitable for water filtration in all walks of life such as industrial water, agricultural water (sprinkler irrigation, drip irrigation), municipal water, domestic water, seawater desalination processes, etc. Air can easily cause corrosion and damage to water pumps, boilers, heat exchangers, refrigerators and other equipment and components in the system, greatly reducing their service life and efficiency. Only setting the exhaust valve at the highest point of the system is not effective. When the pressure is reduced, the gas dissolved in the water will re-form bubbles, especially in front of the water pump, a large amount of gas will be separated. The self-cleaning exhaust filter uses mechanisms such as gas-water separation, sedimentation, and filtration. When water in cooling water, hot water, and chilled water systems enters the self-cleaning exhaust filter, the volume expands and the flow rate decreases sharply. The bubbles in the water separate and rise to the gas gathering area. Small bubbles are adsorbed on the separation plate. When large bubbles are formed, After rising to the gas gathering area, it is discharged through the automatic exhaust valve. In the circulating water with dirt, the dirt settles with the water flow in the filter. After passing through the separation plate, the dirt is accelerated and quickly settles in the dirt storage area on both sides of the filter element. Because the dirt storage area has a large dirt capacity, it only needs Open the drain valve regularly. After the air and dirt are separated, the cleaner water flows into the water pump inlet through the filter element. Due to the impact of the water pump and water flow, the filter element vibrates slightly, which can shake off individual dirt attached to the outside of the filter element to achieve the purpose of self-cleaning.