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@Charada .
Are you rooted?
Do you have a custom recovery installed (CWM or TWRP)?
What is your device and Android version?
I've actually never seen so many versions of the log files before (including the kernel (kmsg) logs).
There should be some upper-limit on how many files get created--i.e., each new one should be called last_log (for the non-kernel logs) and the others should be rolled-off / renamed depending on what the limit of maximum files to keep is (not sure--I'll have to research that).
If you are rooted you should be able to fire-up a rooted file explorer (Root Explorer, etc.) and navigate to the /cache/recovery folder and remove the files that you no longer want.
That's probably the easiest way, but if you have a custom recovery installed, you could start an adb shell session while booted in custom recovery and navigate to the /cache/recovery folder and delete (rm) the files you no longer want/need.
If you are not rooted, then I'm a bit stumped...I'm not aware of any mechanism you can use to remove these if you're not rooted.
Hope that helps!