The present invention relates to a fuel anti-theft device for a freight vehicle, and in particular, by providing a separate auxiliary cap that can open and close the fuel inlet and the motor drive means and the switch means for operation thereof, thereby preventing theft of fuel. The purpose is to make it possible.;In order to achieve this purpose, the present invention can surround the fuel inlet and the cap, and is rotated in a horizontal direction about two parallel rotational shafts, and a pair of half-shaped auxiliary caps capable of opening and closing, and mounted on each rotational shaft of the auxiliary cap And a motor driven by a separate switch while having each driven gear capable of being engaged and geared and a driving gear engaged with any one of the driven gears.;[Index];Cargo vehicle, fuel tank, fuel inlet, cap
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