The invention discloses a micro-nano low-melting-point metal and a preparation method thereof, and a conductive ink and a printing method thereof. The preparation method comprises the following stepsof uniformly mixing the liquid-state low-melting-point metal with a solvent according to a certain ratio for a period of time, so that the surface of the micro-drops generated during the mixing process of the low-melting-point metal forms an oxidation film coated with the micro-drops; standing mixed solution to remove excess solvent in the mixed solution to obtain the micro-nano low-melting-pointmetal. According to the micro-nano low-melting-point metal, the liquid-state whole low-melting-point metal is scattered into micro-nano-scale droplets by mixing with a solvent, and the surface of themicro-drops is rapidly formed into an oxidation film so as to form the low-melting-point metal as a core, a micro-nano low-melting-point metal with an oxide film as a shell, so that physical isolationis formed between the liquid metal micro-drops and the liquid metal micro-drops through an oxidation film, and the problem that the liquid metal liquid drops are scattered after being scattered and then clustered into a whole is avoided, so that the stability of the micro-nano low-melting-point metal is guaranteed.