Organism detection method and device, and wireless power transmission system

Embodiments of the invention provide an organism detection method and device, and a wireless power transmission system. The device includes a first coil, a second coil and a signal processing circuit;the first coil is used for generating a constant magnetic field in to-be-detected space, and the constant magnetic field is used to polarize hydrogen protons in the to-be-detected space; the second coil is used for generating a magnetic field with assigned frequency in the to-be-detected space, the direction of the magnetic field is different from the direction of the constant magnetic field, andthe magnetic field is used for stimulating the hydrogen protons in the to-be-detected space to perform magnetic resonance so as to perform transition from a low energy level to a high energy level; the second coil is also used for sensing the magnetic field of the to-be-detected space in real time after the second coil stops generating the magnetic field with assigned frequency; and the signal processing circuit is used f