Horrifying new surveillance video shows the moment a 51-year-old man was brutally attacked by a hatchet-wielding maniac while at a lower Manhattan ATM.

The footage, obtained by The Post on Tuesday, shows the victim at one of the ATMs inside a Chase Bank vestibule on Broadway near Beaver Street in the Financial District shortly before 5:30 p.m. Sunday when the attacker walks in, removes a hatchet from a dark bag, sneaks up behind him and begins slashing him.

The frightened and bloodied victim tries to fend off the brutal assault, falling to the floor several times as he futilely attempts to grab his crazed assailant’s weapon, the footage shows.

When the unidentified attacker is finished beating the victim, he smashes the screens of the cash-dispensing machines before walking away — and leaving the hatchet and his backpack behind, according to police.

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