An aircraft and its connector where the connector has a first pluggable unit and a second pluggable unit, the end of the first pluggable unit is provided with several terminal pins, the end of the second pluggable unit is provided with several terminal sockets, and the terminal pin and the terminal socket can be operatively connected in a corresponding manner. The end of the first pluggable unit and the end of the second pluggable unit are also provided with an error-proof protrusion part and an error-proof concave part respectively. The error-proof protrusion part and the error-proof concave part are operatively connected in a corresponding manner.