Voters who swept Mayor de Blasio into office by a 49-point margin last year aren’t too thrilled with how he’s been running the city so far.

Just 39 percent of voters said they approve of the job being done by the new mayor, according to a Wall Street Journal/NBC 4 New York/Marist poll.

It showed 10 percent of New Yorkers rating Hizzoner’s job performance two months in as “excellent” and 29 percent calling it “good.”

“He still [has] a lot to do to convince people that he’s on top of the managing of the city and literally making positive changes — that’s not coming through yet to people,” Lee Miringoff, director of the Marist College Institute for Public Opinion, told the Journal.

The mayor has had a challenging start, taking flak for his handling of a string of snowstorms.

He also made headlines for calling the NYPD after an influential campaign supporter was arrested, and for allowing his security detail to flout traffic laws just days after he announced a major traffic-safety plan.