He was the son of Ashton Trow Salt, a surgical instrument maker in Aston, and his wife Emily. He was educated at Camp Hill Grammar School in Birmingham. In 1910, he married Alice Elizabeth, daughter of John Joseph Pratt Edmunds of Hawkesley Hall, King's Norton and had a son and three daughters.
In 1929, he was defeated as Conservative candidate for the Birmingham Yardley constituency in that year's general election, but he was successfully elected two years later. He retained the seat until he was defeated in the July 1945 general election. From 1943 to 1945 he was chairman of the Parliamentary and Scientific Committee. He was knighted in 1945.
He was appointed High Sheriff of Warwickshire for 1952-53.
He was also Managing Director of Salt and Son Limited of Cherry Street, Birmingham.