The Miz says the wrestler who repeatedly stabbed a ref in the head with an iron spike should NEVER be hired again ... telling TMZ Sports the dude should be perma-banned from the squared circle.
"You don't do that stuff," the WWE superstar told us out at LAX on Tuesday ... "That didn't look like a mistake."
If you missed it ... Devon Nicholson -- aka "Hannibal" -- badly injured a ref during a match at an independent event in Irving, Texas on Saturday.