The function of the air compressor filter element is to enter the oil-containing compressed air generated by the host into the cooler, enter the oil and gas filter element for filtration through mechanical separation, intercept and polymerize the oil mist in the gas, and form oil droplets concentrated at the bottom of the filter element and return to The compressor lubrication system makes the compressor discharge more pure and high-quality compressed air; in short, it is a device that removes solid dust, oil and gas particles and liquid substances in compressed air.