The 32-year-old arrived at Frankfurt from Turkish champions Galatasaray in February 2025 and scored four goals in 21 appearances in all competitions for the German side.
Abha announced the move on X alongside pictures from the signing ceremony, saying: "One chance is all he needs ... Michy Batshuayi is Abhawi."
Batshuayi has previously played for Standard Liege, Olympique de Marseille, Chelsea, Crystal Palace, Borussia Dortmund, Valencia, Besiktas, Fenerbahce and Galatasaray.
He was part of Belgium's squad that finished third at the 2018 World Cup and also played at the 2022 tournament in Qatar. Abha began their return to the top flight with a 2-1 defeat by Al Hazem last week.