Laser processing system and method for roller surface burr without regular deflection burr

A laser machining system for roughening the surface of roller in such manner that the roughened dots are irregularly deflected is composed of a machine-tool for driving the roller to be machined to rotate, a laser machining unit moving axially along said roller, and a pseudo-random deflecting mechanism consisting of pseudo-random signal generator, the driver of the motor for making lens to vibrate, and the lens vibrating assemblage comprising lens vibrating motor and reflector. Its method is also disclosed.