The invention discloses a low temperature curing transparent inner iron printing coating. The low temperature curing transparent inner iron printing coating contains raw material by weight part: 40-65 parts of saturated polyester, 5-10 parts of amino resin, 0.2-1 part of modified adhesion promoter, 0.5-1 part of wax powder, 0.1-0.3 part of catalyst and 18-25 parts of environment-friendly organic solvent, wherein the saturated polyester has Tu-4 cup viscosity of 60-80s, acid value of 2-4mgKOH / g, solid content of 55-60wt%, glass transition temperature of 40-50 DEG C, and average molecular weight between 4000Da and 6000Da. Compared with the prior art, by selecting the branched saturated polyester high in acid value and glass transition temperature, crosslinking the selected saturated polyester with partly methyl-etherified melamine formaldehyde resin and n-butyl-etherified melamine formaldehyde resin, which are good in hardness and high in reaction speed, and simultaneously using benzoguanamine resin and isocyanate for auxiliary crosslinking, the low temperature curing transparent inner iron printing coating has good adhesive force to base material, good yellowing resistance, good scratch resistance, strong resistance to corrosion, and good processing performance, and only needs to cure for 8-11min at low temperature of 125-135 DEG C, is environment friendly and safe, does contain materials such as bisphenol A and organic tin, and is a product which meets domestic and international innocuous and harmless test standards.