A Bronx judge threw the book at a thug yesterday who robbed a bus driver at knifepoint.

David Walker, 47, was convicted of first-degree robbery and sentenced to five years after he held up driver Janisha Allen on her Bx22 route in Castle Hill last November.

“Give me all the money that you have,” he snarled at her, according to a Criminal Court complaint.

Detectives from the 43rd precinct quickly collared Walker a day after the robbery.

“We are grateful for the efforts of the NYPD and the Bronx DA’s office to remove a dangerous felon from the streets,” said Darryl Irck, MTA NYCT head of buses.

He said that protecting bus drivers is a top priority that includes partitions, cameras, and training for drivers to prevent dangerous situations.

“We will continue to work closely with the NYPD on these security issues including identifying hot spots where problems most frequently occur,” he added.