O'Sullivan, 34, was detained by police for nine hours.
The three-times world champion was held on suspicion of common assault but released without charge.
He and his partner Jo clashed at a mansion in Chigwell, Essex - thought to be the home the couple share - earlier this week.
Uniformed officers arrived and intervened to calm the situation.
Last night a source said: "It all kicked off and got a bit overheated - these things happen. Tempers were lost and it led to the local old bill being called. Ronnie spent a few hours at the nick cooling off."
An Essex police spokeswoman said: "Police were called at 1.30pm on Tuesday. Both the parties, the arrested man and a woman, received injuries. The man was released without charge at 10pm."
Ronnie and Jo have a daughter Lily, three, and a son Ronnie, two.
The star, nicknamed The Rocket, returned to another of his four Essex properties yesterday. But he denied any bust-up. He claimed: "I've been away. It's news to me."
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