1. An intelligent entrance guard unlocking system comprising: a power unit configured for supplying electric power; a current transmitter electrically coupling the power unit with a transmit coil, configured to receive electric energy supplied by the power unit and transmit the electric energy in a way of wireless electromagnetic radiation via the transmit coil; a first controller coupled to power unit; a first storage unit coupled to the first controller, and configured for storing a predefined fingerprint image; a wireless receiver unit coupled to the first controller; an unlocking unit coupled to the first controller; and a powerless smart key configured for coupling with the comprising: a receiver coil; a current receiver electrically coupled to the receiver coil and configured to receive the electric energy via the receiver coil such that the powerless smart key is powered; a fingerprint capturing unit coupled to a second storage unit, and configured to obtain a fingerprint image of the user and further store the fingerprint image in the second storage unit; and a second controller coupled to a wireless transmit unit with the second storage unit and configured to control the wireless transmit unit to transmit a wireless signal containing the fingerprint image to the intelligent entrance guard; and wherein, the wireless receiver unit receives the wireless signal, the first controller is configured to obtain the predefined fingerprint image from the first storage unit and compare the fingerprint image with the predefined fingerprint image, and the unlocking unit is configured to unlock when the fingerprint image matches with the predefined fingerprint image.