A woman has been arrested after a man's body was found at a home in South Australia.

Police arrived to the home on the Flinders Highway in Port Lincoln after reports of a small fire at 3.35pm yesterday.

Officers found the body of a man inside the home when they entered the property.

A 34-year-old woman was arrested at the scene. She is expected to be charged with the man's murder.

Police believe the pair were known to each other.

There is no ongoing threat to the community. 

Anyone with information is asked to contact Crime Stoppers.