A lithium secondary battery separator with excellent adhesive strength and air permeability is disclosed. The lithium secondary battery separator includes a porous polymer substrate; and a porous coating layer containing inorganic particles and a binder. When the binder is present as a binder specimen with a thickness of 0.4 mm after pressurization at 190° C., the binder specimen comprises a first binder having a tan δ peak at 15° C. to 27.6° C. and a second binder having a tan δ peak at 8° C. to 20.2° C., as measured by dynamic mechanical analysis (DMA).