An apparatus and method for coating an electrode slurry are disclosed herein. In some embodiments, the apparatus includes a coater configured to coat an electrode slurry on a metal foil, a measuring unit is configured to measure a remaining oil level on a surface of the metal foil before the coater coating the electrode slurry, and a controller configured to control the coater to coat the electrode slurry based on a measurement value of the remaining oil level of the surface of the metal foil.