The invention discloses a magnetic field shielding device for a wireless energy transmission system. The shielding device is composed of a demagnetizing coil (30) arranged nearby a coil of the wireless energy transmission system and a demagnetizing capacitor (31) connected in parallel to the demagnetizing coil (30). The demagnetizing coil (30) is placed at a zero coupling position which is coupled with only one of a transmitting coil and a receiving coil but not coupled with the other one, and the demagnetizing capacitor (31) induces demagnetizing current opposite to the current of the coil of the wireless energy transmission system within the demagnetizing coil (30), so as to achieve the effect of weakening original magnetic field radiation of the wireless energy transmission system.