The 49-year-old "Chennai Express" star took to Twitter to share a picture of her and joked he would have been slapped by her for revealing her age, had she been alive today.
"She would be 74 years today and I would be slapped for telling her age... It's a happy day today," he captioned the photo.
Shah Rukh's mother died in 1991 from complications of diabetes, just a year before he made his big-screen debut.
The actor is currently working on Rohit Shetty's "Dilwale", which also stars Kajol, Varun Dhawan, Kriti Sanon, and Vinod Khanna.