SQL Server : log folder too large
It is recommended that you recycle your error log frequently. You can set that up as sql agent job to do that. I do this every night at midnight but you need to decide what is suitable for your environment.

System stored procedure "EXEC sp_cycle_errorlog" will do the recycling for you.

Once you have recycle set up you can decide how many files you want to keep (meaning how many days of error log you want to retain). 


Expand the “Management” folder in SSMS.
Right click on “SQL Server Logs”
Select “Configure”
Check the box “Limit the number of error log files before they are
recycled”
Pick some value to put in the “Maximum number of error log files”
box
Click “OK”
List was copied and edited from here.