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An embodiment of the present invention provides a production method of a rare earth alkyl phosphate solution which comprises the following steps : (a) reacting organic amine with alkyl phosphate in a first solvent to prepare an alkyl phosphate amine salt solution; (b) reacting rare earth metal oxide with acid in a second solvent to prepare a rare earth metal salt solution; and (c) mixing and reacting the alkyl phosphate amine salt solution and the rare earth metal salt solution. An objective of the present invention is to provide a production method of a rare earth alkyl phosphate solution in which the low viscosity is maintained even after a long period of time to exhibit excellent processability and the layer separation phenomenon is prevented to exhibit excellent storage ability.COPYRIGHT KIPO 2018