A member of Adelaide paedophile Shannon McCoole's child exploitation website has had his sentence slashed and could be out of jail within months.

David Glen Cecchin, 29, was originally sentenced to seven years and five months in jail with a non-parole period of four and a half years for producing, disseminating and possessing child exploitation material.

He appealed against the sentence, arguing it was manifestly excessive.

Cecchin was a member of McCoole's online child exploitation ring under the username 'Kinder Surprise'.

McCoole, a former child protection worker, was jailed for 35 years for what the sentencing judge described as the "evil" and "depraved" sexual abuse of young children in state care.

The Court of Criminal Appeal heard Cecchin was diagnosed as a child with Asperger's syndrome, now referred to as autism spectrum disorder, and had been assessed by a psychiatrist as being a "low risk of reoffending".

The court said it accepted the submissions of the Director of Public Prosecutions that the offending was "extremely serious" and deserving of severe punishment, and that Cecchin showed "little or no insight into his offending".

However the court, comprised of Justices David Lovell, Greg Parker and Sam Doyle, unanimously ruled that the sentence imposed was manifestly excessive.

"In my view the sentence imposed is too far above the prevailing standard to be regarded as a proper sentence for the conduct which is to be punished," Justice Lovell said in his judgment.

The court set aside the sentence and imposed a new sentence of four years with a non-parole period of two years and three months.

The sentences were backdated to December 2015, meaning Cecchin will be eligible for parole next March.