Chuck Liddell clearly believes Cain Velasquez should be out of jail by now ... telling TMZ Sports a judge needs to give him bond ASAP.
The UFC legend has been locked behind bars since late February -- after he allegedly tried to kill a man who was accused of molesting one of his relatives.
Liddell -- who's been good friends with Velasquez for years -- told us out at LAX this week it's time for that to change .