The US rapper will be held for 6 more days while an investigation continues into his aggravated assault charges.
The 30-year-old, whose real name is Rakim Mayers, was detained along with his bodyguard and two other members of his entourage over a street fight in Stockholm on 30 June.
The artist has denied the accusation and even posted a video on his Instagram with his version of the events, saying he had been followed and he had not wanted any trouble.
Swedish prosecutors say they need until next Thursday to finish the preliminary investigation.
Rocky's bodyguard has been released without charge while the rapper has had to cancel several shows of his Europe tour.

Mariah Carey to bring Christmas show to Abu Dhabi
Global Village opens Season 31 with drone show, choir performance
Ex-gang leader sentenced to 40 years to life in prison for Tupac murder
Turkish police raid opposition TV channel Halk TV
'Breaking Bad' actor, disability rights activist RJ Mitte dead at 34
