PURPOSE: A fluid filtering device is provided to filter fluid by connecting a flexible hose for device assembly on the middle of the pipe circulating fluid, and to offer filtering function for foreign material filtering automatically. CONSTITUTION: A fluid filtering device comprises the following: an inlet(120) and an outlet(128) with a flange; a base; a filtering pipe connecting the inlet and the outlet; a first filtering pipe with an opening and closing valve installed on the front and the rear of a filtering part; a second filtering pipe arranged on a side of the first filtering pipe; an air filtration part(12) connected with a connection pipe(123); and a gas filtering pat installed at an adjacent of the air filtration part on the base through a support.
