A 25-year NYPD veteran yesterday slammed the Police Department, which fired him last week without explanation, and vowed to seek justice for what he called a “vindictive” prosecution.

Former Sgt. William Lewis was acquitted by a Brooklyn federal jury of allegations he tried to hide money from the taxman.

He was charged in December with “structuring” — trying to duck IRS reports that are triggered when more than $10,000 is taken from a bank account.

He claimed that he was in fact trying to keep the money from his ex-wife.

“I’m finally vindicated,” he said. “It was an absolute witch hunt.”

When the jury foreman read the verdict, Lewis shouted “Thank God!” and slammed his fists down on the defense table as he broke down in tears.