The invention discloses a clutch and braking system of a road roller. The clutch and braking system comprises a throttle control handle, a clutch pedal, a clutch push rod, an installing plate, a throttle rocking arm, a clutch main cylinder, a spring, a throttle flexible shaft, an engine throttle pull rod and a rocking arm flexible shaft. The installing plate is fixed in a cab, the clutch pedal, the clutch rocking arm and the throttle rocking arm are connected with the installing plate through pins, and all the clutch pedal, the clutch rocking arm and the throttle rocking arm can pivot on the pins. One end of the clutch is connected with a pin of the clutch pedal, and the other end is connected with a pin of the clutch rocking arm. The throttle handle is connected with the spring through the rocking arm flexible shaft, the other end of the spring is fixed in a through hole in the lower end of the throttle rocking arm, one end of the throttle flexible shaft is fixed in the through hole, and the other end is connected with the engine throttle pull rod. One end of the clutch cylinder is connected with the clutch rocking arm. The clutch and braking system of the road roller can reduce the rotational speed of an engine when a clutch comes away, impact during gear shift and start can be reduced, abrasion on the clutch can be reduced, and the service life of the clutch can be prolonged.