The present application discloses a filter device, including a housing, a primary filter body, and a secondary filter body. The housing is formed with a first channel for fuel to flow in. The primary filter body includes a support fence, a particulate filter medium, and end covers. The secondary filter body is formed with a second channel for the fuel to flow out from the secondary filter body and is configured to block water and allow the fuel to pass. The filter device in the present invention can make it possible to arrange more particulate filter media in a limited space, thereby improving the filtration capacity of a filter element per unit volume.