Borsig was born in Breslau (Wrocław), the son of cuirassier and carpenter foreman Johann George Borsig. After learning his father's trade, he first attended the Königliche Provinzial-Kunst- und Bauschule (Royal Provincial Art and Building school), then until fall of 1825 the Königliche Gewerbe-Institut (Royal Institute of Trade). He received his practical training in engine construction at the Neue Berliner Eisengießerei (New Iron Foundry of Berlin) of F. A. Egells, where one of his first tasks was the assembly of a steam engine in Waldenburg, Silesia.