Its origins date to 1908, when Sleaford Council School opened at Church Lane to meet the growing demand for elementary education in the town. After the Education Act 1944, the senior department became a secondary modern. A second school building was constructed at Westholme in the 1950s and expanded in 1983, allowing the Church Lane site to close; to mark the occasion, it was renamed St George's School. After it became grant-maintained, the school became a comprehensive, received a Technology specialism, became a Technology College in 1994 and later converted to Foundation status. Throughout the 1990s and 2000s, new buildings were added to the site. Coteland's School in Ruskington federated with St George's in 2007; they merged to form the Academy in 2010. The conversion included a government grant of £20 million to carry out extensive building work on both sites, completed in 2012 at Sleaford and in 2015 at Ruskington.
