The oil separator filter element is mainly designed for oil-water separation, and it contains two types of filter elements, namely, a polymer filter element and a separation filter element. For example, in a water removal system for oil products, after the oil enters the coalescence separator, it first flows through the coalescence filter element, which filters out solid impurities and aggregates small water droplets into larger water droplets. The vast majority of aggregated water droplets can be separated and removed from the oil by their own weight, and settle into the collection tank.