The city’s $11,000 fine on a Manhattan baby sitter making $9,000 a year for posting advertisements on public property was “unconstitutionally excessive,” a judge has ruled.

Manhattan Supreme Court Justice Paul Wooten said in a decision made public Tuesday that the 2011 fine imposed on Washington Heights resident Yasmin Pujols, 45, is “grossly disproportional to the gravity of [her] offense.”

James Bernard, attorney for the Dominican immigrant, said the ruling “does justice for a woman who was just trying to earn a living in difficult economic times.”

The city Law Department said it is reviewing the ruling.