Provided is a separator for a lithium secondary battery including a porous substrate and a coating layer including a binder and inorganic particles formed on one surface or both surfaces of the porous substrate. The binder is a binder including: (a) a (meth)acrylamide-based monomer polymerization unit, (b) a (meth)acryl-based monomer polymerization unit containing a hydroxyl group, and (c) a polyfunctional (meth)acrylamide-based monomer polymerization unit. The separator according to the present invention provides a separator for a lithium secondary battery having improved adhesive strength between the inorganic particles and the separator, showing a decreased interfacial resistance characteristic, and showing an improved air permeability.