'That '70s Show' Star Lisa Robin Kelly -- I'm INNOCENT ... My Roommate Attacked Himself!

"That '70s Show" actress Lisa Robin Kelly says she's been SET UP by her male roommate ... who injured HIMSELF in an effort to frame the actress as a domestic abuser.

TMZ spoke with Lisa ... who insists she was wrongfully arrested for allegedly attacking the guy at their L.A. home this weekend ... because she never laid a hand on the guy.

Lisa says she's been having issues with the guy for a while ... and tried to leave the pad for good on Friday, but he became angry and "roughed me up."

Lisa says she called police ... but the guy took off before they arrived ... and she decided it wasn't worth her time to press charges.

A short time later, the roommate showed up at the police station claiming Lisa had attacked him ... something Lisa insists NEVER happened.

"He must have scratched himself or done something to himself," Lisa says.

She adds, “I am clean and sober and I have made a lot of progress. I am completely innocent. I weigh 105 pounds. I could never hurt him. I just want to start working again."