But I already see this script… is familiar…
It’s one of my scripts!!! 
http://forum.mikrotik.com/t/create-an-address-list-from-a-text-file/77741/3
If you provide on the file one list of IP like
1.1.1.1,2.2.2.2,3.3.3.3,4.4.4.4, etc.
you can alter the script for be more simple:
:local arrayofip value=[:toarray [/file get [/file find where name="Iptest.txt"] value-name=contents]];
:foreach ip in=$arrayofip do={
/system ssh address=$ip port=22 user=admin command="/system reboot;\r\ny\r\n" output-to-file=tmp;
/delay delay-time=10s;
};
Use one reasonable time between SSH commands.