A Queens man stabbed the mother of his children in an early morning attack Tuesday, cops said.

Juan Portoviejo, 33, is wanted for stabbing his ex-girlfriend multiple times in the neck and torso, police said.

The 31-year-old victim was on her way home from work and had exited a livery cab on Foley Street and Lamont Avenue in Elmhurst just before 5 a.m. when her crazed ex attacked, police said.

The woman was rushed to Elmhurst Hospital with injuries including a punctured lung and slit throat, but is expected to survive, officials said.

Portoviejo came after her previously Aug. 13 — again as she exited a taxi coming home from work — and choked her after she tried to leave him, officials said.

He has been arrested once before, on July 26 of this year for driving while intoxicated, police said.

The pair has two children together, cops said.