Somebody trying to connect on my AP on MikroTIK router, but he doesn’t know my password.
I received this message. MAC ADRESS@wlan1: unicast key exchange timeout
I wont to find out what he type like password?
Bad luck. It is not possible.
RouterOS not store wifi password, that is recuired to access to internet. So you cannot see, what some user write like password. 
Do you have unique SSID?
Because if you have common (e.g. Internet) many devices will try to login when walking around because of previously stored login from other location.
Maybe SSID change will solve your problem.