A Victorian man who paid an overseas surrogate to give birth to twin daughters, brought the girls to Australia where he filmed himself sexually abusing them and shared the footage with other paedophiles, a court has heard.

The 49-year-old father, who cannot be named, was jailed for 22 years after pleading guilty to 37 charges including 20 counts of incest and two of child trafficking.

Prosecutors said it was an admission he brought the girls to Australia for sexual services.

He abused his daughters on a weekly basis for eight months from when they were one month old.

The court heard the offences against the twins followed four years of abusing his nieces, who were drugged so he could film himself engaging in sex acts.

He began abusing his nieces when they were four and six.

The court was told the man masqueraded as a woman when he went online to seek out and share child exploitation material, including films and images he produced of himself with his daughters and nieces.

Man's offences morally repugnant, judge says

In sentencing, Victorian County Court Judge Susan Cohen said his morally repugnant offending struck at the core of the joys and privilege of bringing children into the world.

"You deliberately entered into an agreement whereby your own children would be born and brought to Australia [for sexual exploitation]," Judge Cohen said.

"As newborns they could not have been more vulnerable or dependant upon you."

Judge Cohen said the man had expressed relief after police raided his house in November 2014 and uncovered 26,343 child exploitation films and images, many of which he had produced.

The man said he was sick and sad following his arrest.

He told police: "I love them so much. I don't know why I did it."

Judge Cohen said the man would have a long and lonely time in prison, having destroyed his relationship with his wife and family.

She ordered the man to serve a minimum of 15 years and six months before being eligible for parole.

ABC/AAP