A method of manufacturing a shim for a die coater is disclosed herein. In some embodiments, a method of manufacturing a shim for a die coater, where the shim is applied to an electrode slurry die of the die coater and used for discharging an electrode slurry from the die coater, comprising milling a surface of a metal plate to prepare the shim. Using the method herein, it is possible to manufacture a shim for a die coater having a low thickness deviation by processing the shim for a die coater through a milling process.
