Provided is high-stability particle free type silver-based conductive ink and preparation method thereof. The conductive ink is composed of a silver precursor, other precursors, chelating agents or complexing agents and a solvent, wherein the mass percentage of the silver precursor, the mass percentage of the other precursors, the mass percentage of the chelating agents or complexing agents and the mass percentage of the solvent are 10-45%, 0.05-1%, 10-81.5% and 8-79.5% respectively. The preparation method comprises the steps that the chelating agents or complexing agents are dissolved in the solvent according to the proportion firstly and are evenly mixed, then the silver precursor and the other precursors are added to the mixed liquid, stirring is carried out under 0-25 DEG C for 0.5-12h until the mixtures are solved, and the high-stability particle free type silver-based conductive ink is obtained after filtration. The high-stability particle free type silver-based conductive ink is free of sediment for one month if being stored under natural light, is free of sediment for three months if being stored in a dark place under room temperature, and is free of sediment for six months if being stored in a dark place under low temperature. The viscosity of the ink is 1-1000mPa.s, and the surface tension of the ink is 20-50mN/m.