The minister told a news conference the statue was almost certainly Psamtek I, who ruled between 664 and 610BC.
Experts had thought the statue was Ramses, who ruled 600 years earlier, because it was close to a temple dedicated to the ruler.
However, one of Psamtek’s five names was found engraved on the huge statue.
Even so, the find is still significant, Khaled el-Anani said.
The discovery was made after they moved the statue – which was 29ft tall originally – from a wasteland in between apartment blocks on the site of the ancient capital, Heliopolis, to the Egyptian museum in central Cairo.
It was found by an Egyptian-German archaeological team, and was partially submerged in water, and had split into a number of parts. Its torso alone weighed three tonnes.
Egypt’s Ministry of Antiquities said it hoped the two parts could be put back together again.
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