Mayor de Blasio’s Summer All Out program is turning into an all-out fiasco — with the NYPD forced to dole out massive overtime and cops choosing to retire rather than take part, The Post has learned.

Hizzoner’s highly touted anti-crime initiative is also relying on longtime NYPD desk jockeys to tame the city’s increasingly dangerous streets, which law-enforcement sources called a recipe for disaster.

Summer All Out flooded the city’s 10 worst precincts with 330 extra cops on June 8 — a month earlier than last year — to combat the recent spike in shootings and murders.

The cops, formerly assigned to administrative jobs, were initially supposed to work from 8 p.m. to 4 a.m., when most violent crimes take place.

But to quell widespread opposition among the rank and file, brass promised fatter paychecks containing at least 4¹/₂ hours of overtime per shift — or 22¹/₂ per week.

The sweetened deal includes a shift that begins a half-hour early, at 7:30 p.m., and at least two hours of guaranteed extra work per shift. The cops are also getting paid 2¹/₂ hours of overtime per shift to cover travel time to and from their new precincts — regardless of how long it actually takes.

But some veterans decided they’d rather walk away from their careers than walk a dangerous beat, sources said.

“Three or four . . . officers were sent to a certain precinct in Brooklyn, and instead of going and walking foot posts, they up and retired,” one source said.

Many of the All Out cops have been working desk jobs for a decade or more, so everyone underwent a two-day refresher course to get them familiar with the violence – and crime – plagued neighborhoods they have to patrol.

The crash course wasn’t nearly enough to prepare the cops for the dangers of facing down perps emboldened by de Blasio’s crackdown on stop-and-frisk and his anti-police rhetoric, sources said.

“Most of these cops have a cushy desk job, work from 7 to 3 or 6 to 2, pushing paper and then go home to Long Island,” one source said. “Now they are being thrown into the streets in the 75th or the 73rd [precincts] and they’re shell-shocked. They don’t know what to do.”

Many cops believe the All Out overtime would be better spent by letting existing patrol cops just work longer hours.

“If they have this kind of money to spend on overtime, they should just hire more cops,” one source said.

Others noted that while Summer All Out is supposed to target gun violence, many of the cops are being given “bulls- -t” assignments like enforcing minor traffic violations.

NYPD spokesman Stephen Davis defended Summer All Out, noting its success last year “in some of the precincts where it was deployed.”

“They’re not replacing street cops; they’re adding to cops on the street,” he said.