Abstract: The present disclosure provides a stannous salt complex catalyst and a method for producing L-lactide by using the same. The catalyst is obtained by reacting stannous salt and phosphite in a solvent, which can effectively inhibit the oxidation of divalent stannous ions to tetravalent tin ions, effectively reduce the conversion rate of meso-lactide, increase the yield of L-lactide, and obtain nearly white L-lactide. In the crude lactide produced after the depolymerization reaction, the content of L-lactide is more than or equal to 95 %; the content of meso-lactide is less than or equal to 3.8 %, while ensuring that the color of the residual liquid is close to milky white.