Mama June -- Warning All U Girls ... Sugar Bear's Still a Cheater

Mama June is back on the attack against Sugar Bear, claiming he's still on the prowl for women ... lots of them.

June vented on her personal Facebook page ... complaining she's taking all the heat for dating Mark McDaniel while SB is playing the victim when actually he's "a cheater and a big player."

She says Sugar Bear is trying to snare girls through Snapchat. She also admits she's rifled through his phone and found concrete proof he's on the hunt.

TMZ broke the story ... Mama June claimed she broke up with SB after she found he was trolling online dating sites. But then we found out she was dating the man who served time for molesting her daughter, and everything changed.

And get this ... Mama J thinks Sugar Bear is a lady killer, warning, "he has already scammed many girls on here to fell in love with them," adding, "so baby if u think u r his one in only u r wrong big time."

Don't hate the playa.