The invention provides a preparation method of an iron-based SmFeAsO<1-x>Fx
superconducting wire, comprising the steps as follows: a: material preparation: the material is prepared according to the
stoichiometry of the iron-based
superconducting material SmFeAsO<1-x>Fx (wherein, x is not more than 0.35 and not less than 0.15, the raw materials such as SmAs, Fe, Fe2O3 and FeF3 are weighed, grinded, uniformly mixed, arranged into a
Tantalum pipe, fully fixed and compacted; the two ends of the
Tantalum pipe are sealed; b: wire preparation: the
Tantalum pipe is sheathed into a
copper pipe and rotatablely forged; subsequently, the wire with the
diameter of 1.8-2.2mm is formed by pulling and drawing; c: burning: the wire is arranged in a
quartz pipe and sealed in vacuum and then put into a
sintering furnace; under the protection of
inert gas, the temperature of the wire is increased to 1150-1170 DEG C at the speed of 100-150 DEG C / hour, the temperature is kept for 36-50 hours and the wire is cooled with the furnace. The method of the invention has the advantages of simple technology and facilitating industrial production, and the compactness, high purification, stable superconducting performance, high superconducting conversion temperature and high
critical magnetic field of the prepared iron-based SmFeAsO<1-x>Fx
superconducting wire.