You can't. If you could that would defeat the purpose of bitcoin. Your going to just have to learn from it and have better account security.
Cant I yust go to the police when I get IP adress from the site from where he hacked me or let an other hacker hack his wallet?
You seriously need to read up on the basic workings of bitcoin before you buy so much. The police are unlikely to do much cause they don't really care about cryptocurrencies, not to mention that the attacker almost certainly spoofed his ip. Also you can't "hack" someones wallet.