She was 72.
"Singh's wife passed away this morning. She had cancer and fought it for nine years," a statement issued here on behalf of his son Vindu Dara Singh said.
Surjit was Singh's second wife and mother of actor Vindu.
The last rites will be performed at 6 PM this evening at Juhu crematorium in suburban Mumbai.
The 83-year-old wrestler-actor had passed away in 2012 following a cardiac arrest.