Michael Aubin admitted to two counts of gross indecency and two counts of indecent assault on children under ten years old.
Aubin, who appeared before the Royal Court, carried out the sexual abuse on boys while he was a resident at the home in the 1970s.
Aubin is the first person to be brought to court after a police investigation into historic child abuse on the island.
He previously pleaded not guilty to three additional counts of indecent assault. Those counts will be dealt with after Aubin is sentenced on June 22.
Two other people have been charged in connection with the Haut de la Garenne abuse scandal and police have amassed a list of 40 additional suspects.
Finally some justice in Jersey! Personally I am stunned, but extremely pleased with this victory!
This is a great day for the abuse victims, Senator Syvret, Lenny Harper, Graham Power and Simon Bellwood. Well done, you all have been vindicated!