A monodisperse transition metal nano-catalyst for Fischer-Tropsch synthesis and a preparation method therefor and an application thereof. The catalyst comprises transition metal. The transition metal is stably dispersed in an organic solvent in the form of monodisperse metal nanoparticles. The particle size of the transition metal is 1-100 nm. The specific surface area of the catalyst is 5-300 m2/g. The dispersity of the metal nanoparticles of the catalyst is high, and the catalyst can be directly applied to a Fischer-Tropsch synthesis reaction without filtering, cleaning, high-temperature roasting, and activated reduction.
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