The invention discloses a 
wireless charging, alignment and 
metal foreign body detection 
system of an electric automobile and a method thereof. The detection 
system comprises a transmitting coil, a receiving coil, a probe, a 
signal conditioning module and a control module connected with the 
signal conditioning module, wherein the transmitting coil is connected with the output end of a 
wireless charging and transmitting device on the ground surface of a 
parking lot, the receiving coil is connected with the input end of a 
wireless electric energy receiving device of an electric automobile 
chassis and is mutually coupled with the transmitting coil, and the probe is laid on the surface of the transmitting coil and is mutually coupled with the transmitting coil and the receiving coil. The probe is of an axis-
symmetric structure and is composed of two coils equal in size and turn number and opposite in winding direction. The probe is consistent with the boundary of the transmitting coil in size. The 
signal conditioning module is used for receiving 
voltage signals output by two output ends of the probe and conducting amplification, 
filtration and peak-holding 
processing on the two signals output by the two output ends. The control module is used for obtaining the difference of the two received 
voltage signals and comparing the obtained 
voltage signal difference value with a preset voltage threshold value.