A fast-moving bank robber hit four Brooklyn banks in just two hours, cops said on Thursday.

The bandit first struck a Capital One bank branch on Ralph Avenue near Avenue K in Flatlands, where he passed a teller a note demanding cash at around 12:30 p.m. Monday, cops said.

He made off with $1,800 and then hit a Chase Bank roughly 20 blocks away on Flatbush and Flatlands avenues at around 1:55 p.m. — but the teller refused to hand over any cash, so he fled empty-handed, police sources said.

Not discouraged, he tried again at 2:10 p.m. at Northfield Bank on Kings Highway near East 12th Street, where a second teller wouldn’t give him any money either, cops said.

Then he high-tailed it to Santander Bank on Avenue U and McDonald Avenue in Gravesend 20 minutes later.

There he scored $4,500, but not before cameras captured an image of him wearing sunglasses, black jeans and a hoodie, police sources said.