Disclosed are a magnetic nanometer temperature imaging method: first, applying a constant DC magnetic field and an AC magnetic field simultaneously to the region of a magnetic nanoparticle sample, acquiring an AC magnetic intensity signal of the magnetic nanoparticles, and detecting each odd harmonic amplitude then, replacing a constant DC gradient field with a combined DC magnetic field containing a gradient magnetic field, acquiring the AC magnetic intensity signal of the magnetic nanoparticles, and detecting each odd harmonic amplitude calculating the difference between the two harmonic amplitudes establishing a relation between the odd harmonic amplitude difference and the temperature using Taylor series expansion of a Langevin square function, and solving the relation to obtain an in vivo temperature finally, changing the DC gradient field to the next position until the completion of temperature measurement in the whole one-dimensional space. The present invention applies different excitation fields to magnetic nanoparticles, thus transforming temperature imaging of the one-dimensional space to solve each point temperature in a small interval, further obtaining the one-dimensional temperature field precisely and rapidly without knowing the concentration of the magnetic nanoparticles.La présente invention concerne un procédé dimagerie magnétique thermique nanométrique comprenant : en premier lieu, lapplication dun champ magnétique C.C. constant et dun champ magnétique C.A. simultanément à la région dun échantillon de nanoparticules magnétiques, lacquisition dun signal dintensité magnétique C.A. des nanoparticules magnétiques, et la détection de chaque amplitude dharmonique impaire ensuite, le remplacement dun champ à gradient C.C. constant par un champ magnétique C.C. combiné contenant un champ magnétique à gradient, lacquisition du signal dintensité magnétique C.A. des nanoparticules magnétiques, et la détection de chaque amplitude dharmonique impaire le calc
