Mayor Bill de Blasio said Tuesday that the veteran NYPD cop accused of torturing his autistic 8-year-old son and leaving him to freeze to death inside his Long Island garage “should burn in hell.”

“It’s disgusting. It’s incredibly troubling. And I don’t understand how any human being does that to a child. I especially don’t understand how a sworn officer does that,” de Blasio said of since-suspended NYPD Officer Michael Valva, 40, while speaking at an unrelated press conference in Brooklyn.

“And you know, I think this is someone — when all the facts are proven — this is someone who should burn in hell, from my point of view,” the mayor said.

Valva, a 15-year police veteran, and his fiancée, Angela Pollina, 42, were slapped with second-degree murder charges Friday in the Jan. 17 death of little Thomas Valva.

Authorities say the twisted couple subjected the boy to “freezing temperatures” in the “unheated garage” at their home in Center Moriches for an entire night when temperatures outside were a teeth-rattling 19 degrees.

Valva and Pollina have both pleaded not guilty and remain locked up.

The cop was immediately suspended without pay and stripped of his guns.