A suspect chomped off part of a cop’s finger inside a Brooklyn police station Friday night, law enforcement sources said.

The officer lost the tip of his left middle finger during the bloody encounter inside a holding cell of the 69th Precinct station house in Canarsie at about 6 p.m., sources said.

The cop was rushed to Kings County Hospital. The prisoner, Ainsley Johnson, 34, had been under arrest on a criminal mischief charge.

Charges for the chomping incident were not yet known.

He has a rap sheet that includes 10 previous busts for offenses such as resisting arrest and forgery.