The invention discloses a filter applied to a cooling system of high-power electrical and electronic equipment. The filter comprises a casing, wherein a baffle dividing an inner cavity of the casing into a left-side liquid outlet cavity and a right-side liquid inlet cavity is arranged inside the casing; the liquid inlet cavity and the liquid outlet cavity are communicated through a filter element installed in the liquid inlet cavity, the left end of the filter element is fixed on the baffle and provided with a connector matched with the baffle in an inserting manner or a threaded connection manner, and the right end of the filter element is provided with an end cover; a positioning and supporting mechanism used for positioning and supporting the end cover is arranged in the casing; and when the connector is in threaded connection with the baffle, a hexagonal prism which can be sleeved with a spanner so as to screw the filter element is fixedly arranged on the right end surface of the end cover. By the aid of the filter, the stability of the filter element is guaranteed, even if the filter element is impacted by high-pressure water for a long time, one end of the connector of the filter element is free from inclination or looseness, the filtering effect is lasting, and the stable operation of related equipment can be guaranteed.