A fuel filter for a vehicle may include an upper case with a fuel inlet at a first side; a lower case provided in a structure having a fuel outlet and bonded to a second side of the upper case; and a main filter disposed in an inner space by bonding the upper case and the lower case and filtering fuel, wherein a first auxiliary filter assembly filtering the fuel toward an inner diameter of the main filter is mounted on a first surface of the main filter and a second auxiliary filter assembly filtering the fuel toward a second surface of the main filter is mounted on the second surface of the main filter.