A living body radar system, comprising: an image analysis unit for receiving a signal detected by a radar and signally processing the signal to produce a plurality of sample points to form an image signal; a frequency spectrum analysis unit for receiving the signal and signally processing the signal to produce a frequency spectrum signal; and a calculation unit electrically connected with the image analysis unit and the frequency spectrum analysis unit, the calculation unit comprising a feature extraction portion and a match identification portion, the feature extraction portion receiving the image signal and the frequency spectrum signal and carrying out a feature extraction operation to acquire a target feature of a target object, the match identification portion carrying out a comparison operation on the target feature, wherein the match identification portion is electrically connected with a feature database; the feature database stores a comparison feature (F2/F3) of a living body; when the match identification portion carries out the comparison operation on the target feature, the match identification accesses the comparison feature (F2/F3) and compares the target feature with the comparison feature (F2/F3), wherein the comparison feature (F2/F3) is acquired by the feature extraction operation on an image sample signal and a frequency spectrum sample signal that are acquired by the radar detecting a living body, characterized in that the living body is a human body; when the comparison feature (F2/F3) is compared with the target feature, the image signal is compared with a lower limbs motion of the human body in the image sample signal, and the frequency spectrum signal is compared with the lower limbs motion and a body motion of the human body in the frequency spectrum sample signal. an image analysis unit for receiving a signal detected by a radar and signally processing the signal to produce a plurality of sample points to form an image signal; a frequency spectrum analysis unit for receiving the signal and signally processing the signal to produce a frequency spectrum signal; and a calculation unit electrically connected with the image analysis unit and the frequency spectrum analysis unit, the calculation unit comprising a feature extraction portion and a match identification portion, the feature extraction portion receiving the image signal and the frequency spectrum signal and carrying out a feature extraction operation to acquire a target feature of a target object, the match identification portion carrying out a comparison operation on the target feature, wherein the match identification portion is electrically connected with a feature database; the feature database stores a comparison feature (F2/F3) of a living body; when the match identification portion carries out the comparison operation on the target feature, the match identification accesses the comparison feature (F2/F3) and compares the target feature with the comparison feature (F2/F3), wherein the comparison feature (F2/F3) is acquired by the feature extraction operation on an image sample signal and a frequency spectrum sample signal that are acquired by the radar detecting a living body, characterized in that the living body is a human body; when the comparison feature (F2/F3) is compared with the target feature, the image signal is compared with a lower limbs motion of the human body in the image sample signal, and the frequency spectrum signal is compared with the lower limbs motion and a body motion of the human body in the frequency spectrum sample signal.