An airman caught in an explosion during the Talisman Sabre military exercise in central Queensland has died of his injuries.

RAAF Sergeant Michael Dunn suffered third-degree burns to his upper body when the portable toilet he was inside at Rockhampton airport exploded on July 25.

Defence says he died in hospital this morning.

Chief of Air Force Air Marshal Geoff Brown says the RAAF's thoughts are with Sergeant Dunn's family and colleagues.

"Sergeant Dunn was highly respected and well-liked by his colleagues," he said in a statement.

"Those who visited Mick since the accident were all affected by the courage and determination that he showed during his treatment and are extremely saddened by his passing.

"Our thoughts are with the family, friends and colleagues of Sergeant Dunn.

"Sergeant Dunn served 27 years in the RAAF. Most recently he was serving at RAAF Base Tindal where he and his family were long-standing members of the Katherine community."

Defence says a thorough investigation into the incident is continuing and further details may become available once the investigation is complete.