Warburton, who announced his injury-enforced retirement at the age of 29 last July, will serve as a technical advisor for the breakdown and defence on a campaign-to-campaign basis.
His appointment was confirmed on Friday, along with that of Byron Hayward, who will return to the WRU as defence coach.
"I'm delighted to be part of the senior national coaching team," said Warburton, who also skippered the British and Irish Lions during his illustrious playing career, in a WRU statement.
