Dana White says reports that UFC star Joanna Jedrzejczyk was in danger of missing weight for her main event fight this weekend are COMPLETE BS ... and says she's good to go!!

Jedrzejczyk is fighting Michelle Waterson in Tampa on Saturday -- but there were several reports that the fight was in jeopardy over questions about Joanna being able to make the 116-pound weight limit.

White says UFC's network partner, ESPN, fueled the misinformation -- and he's FIRED UP about it.

"This is madness!!!" White says... "Yesterday, my partner, ESPN, put up on their ticker tape Joanna Jedrzejczyk didn't make weight. The weigh-ins are today!!!"

Both Joanna and Michelle DID make weight and the fight is good to go.

We asked Dana why he thinks there were questions surrounding Joanna's weight -- and he chalked it up to "head games" the veteran fighter was playing on her opponent.

"What has been happening is there has been some head games going on between two veterans who are fighting in the main event in a fight that is very important in both of their careers and to see who gets the next title shot."

"And, all these MMA suckers fall for it because they're hearing things behind-the-scenes."