A method for remote temperature measurement of a magnetic nanoparticle based on paramagnetism, comprising: a)positioning a magnetic nano sample at a to-be-measured object; and b)obtaining a temperature T of said to-be-measured object; characterized in that step b) comprises: 1) setting a plurality of excited magnetic fields H i, wherein i = 1, 2...n, n is the number of said plurality of excited magnetic fields, each of said plurality of excited magnetic fields H i is constant, and each of said plurality of excited magnetic fields H i is different from the rest of said plurality of excited magnetic fields; 2)applying one of said plurality of excited magnetic fields on an area of said magnetic nano sample, collecting magnetization of said magnetic nano sample under said one of said plurality of excited magnetic fields, and calculating magnetic susceptibility under said one of said plurality of excited magnetic fields according to said magnetization; 3)repeating step b) 2) for all of said plurality of excited magnetic fields and collecting a plurality of magnetic susceptibilities χ i, respectively, corresponding to said plurality of excited magnetic fields H i; 4) constructing equations between said plurality of magnetic susceptibilities χ i and said plurality of excited magnetic fields H i of said magnetic nano sample 1 χ i = H i NML MH i kT, i = 1, 2... n, wherein a reciprocal of the Langevin's function L MH i kT: is 1 L α = ∑ j = 0 J c 2 j − 1 α 2 j − 1, α = MH i kT, c 2 j -1 is a polynomial coefficient, J + 1 is a predetermined polynomial expansion term, N is concentration of said magnetic nano sample, M is atomic magnetic moment of said magnetic nano sample, and k is a Boltzmann's constant; and 5)solving said equations whereby obtaining said temperature T. a)positioning a magnetic nano sample at a to-be-measured object; and b)obtaining a temperature T of said to-be-measured object; 1) setting a plurality of excited magnetic fields H i, wherein i = 1, 2...n, n is the number of said plurality of excited magnetic fields, each of said plurality of excited magnetic fields H i is constant, and each of said plurality of excited magnetic fields H i is different from the rest of said plurality of excited magnetic fields; 2)applying one of said plurality of excited magnetic fields on an area of said magnetic nano sample, collecting magnetization of said magnetic nano sample under said one of said plurality of excited magnetic fields, and calculating magnetic susceptibility under said one of said plurality of excited magnetic fields according to said magnetization; 3)repeating step b) 2) for all of said plurality of excited magnetic fields and collecting a plurality of magnetic susceptibilities χ i, respectively, corresponding to said plurality of excited magnetic fields H i; 4) constructing equations between said plurality of magnetic susceptibilities χ i and said plurality of excited magnetic fields H i of said magnetic nano sample 1 χ i = H i NML MH i kT, i = 1, 2... n, wherein a reciprocal of the Langevin's function L MH i kT: is 1 L α = ∑ j = 0 J c 2 j − 1 α 2 j − 1, α = MH i kT, c 2 j -1 is a polynomial coefficient, J + 1 is a predetermined polynomial expansion term, N is concentration of said magnetic nano sample, M is atomic magnetic moment of said magnetic nano sample, and k is a Boltzmann's constant; and 5)solving said equations whereby obtaining said temperature T.