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This utility model discloses a fuel filler cap, including a fuel filler cap body and a vent valve assembly disposed within the fuel filler cap body and capable of automatically opening and closing to establish an internal and external communication channel. The vent valve assembly includes a valve core, which is subjected to a pre-tightening force to close the internal and external communication channel. The valve core can be controlled to deform, and this deformation overcomes the pre-tightening force and opens the internal and external communication channel. The fuel filler cap of this utility model, with its automatically opening and closing vent valve assembly, can effectively prevent oil emulsification at the fuel filler cap, significantly reducing the probability of false engine diagnostics.