Suffolk County is set to dramatically boost its police ranks — including by potentially siphoning off cops from the NYPD who are furious over the Big Apple’s COVID-19 vaccine mandate.

Democratic County Executive Steve Bellone will announce Monday that he is hiring 705 law enforcement personnel, bucking the “defund the police” movement in his own party, sources said.

“This is the largest one-year increase in law enforcement personnel in Suffolk County history,’’ Bellone, who is eyeing a run for governor, told The Post on Sunday. “We have opposed the slogan, “Defund the Police.’ ”

But Suffolk’s gain could be the NYPD’s pain — as scores of Big Apple officers are furious over Mayor Bill de Blasio’s requirement for city workers, including police, to get the vaccine by Monday.