Hundreds of firefighters and union officials took to the steps of City Hall Monday to blast the mayor for blocking attempts to increase disability benefits for new FDNY hires who get injured on the job.

Uniformed Firefighters Association boss Steve Cassidy said new firefighters who are hurt in the line of duty and unable to work are paid a pittance of $27 a day or about $10,000 a year, while injured veterans are paid considerably more.

“This is a job where you run into burning buildings to earn your pay,” Cassidy said. “It is preposterous that the de Blasio administration, 15 months in, has not figured out a way to solve this.

“We cannot have a . . . system where some firefighters are protected and the new recruits are completely unprotected.”

Under the current system, firefighters hired before July 2009 are entitled to 75 percent of their salary if they go on disability, while firefighters hired after are only given 50 percent.

That would mean the most recent hires would only receive the paltry sum of $27 if they get injured.

De Blasio has opposed increasing benefits on the grounds that it would take a huge chunk out of the city’s budget.