A heartless goon pretended to be a helpful cop before pickpocketing a blind man outside a Manhattan subway station on Monday, law enforcement sources said.

The 64-year-old legally blind rider was about to enter the 34th Street Station to ride an E train at Eighth Avenue at 4:30 p.m. when the callous crook approached, sources said.

The suspect identified himself as a police officer and offered to help the visually impaired man through the turnstile – which he did, while also lifting the man’s wallet.

The robber took off on foot and police have recovered surveillance video of the troubling incident, sources said.