a sheet for protecting a paint film is disclosed , which does not cause deterioration or discoloration the paint film even when the sheet is adhered to protect the paint film under the condition containing water or water vapor over a long period of time and thus can maintain the adhered state without peeled off the sheet . the sheet for protecting a paint film comprises a multi - layer substrate comprising a water or water vapor barrier layer as a surface layer and a water or water vapor - permeable layer as a back , and a pressure - sensitive adhesive layer formed on the water or water vapor - permeable layer .