Abstract: A filter device having composite filter core, comprising: a shell, of a barrel-shape; a composite valve, fixed onto an upper end of the shell, with its upper side provided with a water input port and a water output port side by side, and connected respectively to an outside water pipe; a first filter core, of a barrel-shape, disposed longitudinally in the shell, and fixed onto bottom of the shell; a second filter core, sleeved in the first filter core, and fixed onto bottom of the shell; a water purifying tube, having openings at both ends, with its one end connected to the water output port, and with its other end connected into the second filter core; and a baffle, disposed on both sides of the water purifying tube and extending outward, and fastened to outer side of the first filter core.