The invention discloses an environment-friendly leuco dye vegetable oil solvent, prepared from the following components by mass percent: 10-40% of component A, 40-750% of component B and 10-20% of methyl chloride, and the sum of the mass percentage of the above components being 100%. The component A is vegetable oil or vegetable oil methyl ester, and the component B is epoxy vegetable oil or epoxy methyl ester.