PURPOSE: A manufacturing method of nanofluid is provided to improve the thermal conductivity and dispersion stability of the nanofluid using graphene, which is reduced by a mechanical mixing operation, as filler. CONSTITUTION: A manufacturing method of nanofluid includes the steps of: manufacturing a graphene oxide solution by dispersing graphene oxide into a solvent; and mechanically mixing the graphene oxide solution to be reduced into reduced graphene. The solvent is based on water or ethylene glycol. The mass ratio of the graphene oxide in the graphene oxide solution is in a range of 0.001-0.1 with respect to the solvent. The speed of the mechanical mixing operation is 10000-20000rpm, and the duration of the operation is from 10 minutes to 2 hours.
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