Will my husband still be able to get his citizenship if he was deported 7 years ago and has since returned?

You don't give us enough facts. Did he come over illegally the 2nd time? Are you a US Citizen? If so, have you filed an I-130 petition for him? The fact that he was deported does not determine whether he can become a citizen or not. There are many other factors that determine that such as criminal record. Write back and give us more detail.

If your husband returned to the US without prior permission from the USCIS, his entry is illegal and he is subject to arrest and prosecution for illegal entry after being deported. Need to know more about his immigration history and the circumstances of his return to better advise you.