The man abducted the young girl, referred to in the Swedish media as Anna, in early November last year, prompting an 800-strong search-party to hunt for the girl.
The 25-year-old was himself part of the team, eventually claiming that he found the girl in a nearby park and turned her in.
She had been missing for a total of 20 hours.
However, soon after Anna had been found, the man confessed that he had in fact taken the girl.
While the man has admitted to “unlawful detention”, prosecutors argue the crime should be classified as a kidnapping, which carries a tougher penalty.
The 25-year-old claimed he saw Anna walking to school and grabbed her, taking her into his apartment where he tied her up, according to the TT news agency.
He also stuck his fingers in the girl’s mouth.
The man’s apartment was subsequently raided by police, who found over 300 pictures of child porn on his computer.
Anna is not believed to have been a victim of any sexual attacks, nor was she a part of the man’s porn collection.
The 25-year-old told the girl during the kidnapping that he was dangerous, and that he would sell her as a sex slave. He also showed her three knives that he had in the room.
An acquaintance of the man claimed that the suspect had fantasized about young girls before, claiming that he wanted to harm them. The acquaintance will testify in court.