There are generally several methods for batch leveling small copper sheets:

1. Mechanical leveling method: Use a leveling machine or press to flatten small copper sheets to achieve a smooth effect.

2. Hot leveling method: Place small copper sheets into a heat treatment furnace for heating, and use mechanical or hydraulic force to level them.

3. Cold leveling method: Place small copper sheets in coolant for cooling, and then use mechanical or hydraulic force to level them.

4. Stretch leveling method: Fix the small copper sheet on the fixture, and then stretch it to a flat state through a stretching machine.

Mechanical leveling method is best method need to the specific situation of the small copper sheet to ensure effective leveling to the small copper sheet.