Disclosed is a double-path power feedback system for a laser processing device. Besides that a laser output power detection circuit (10) is arranged at an output end side of a laser (2), a processing point is provided with a processing point laser output power detection circuit (6), whose input end is connected with an output end of a laser emitting unit (5) through a splitting and coupling lens, and whose output end is separately connected with a negative feedback control circuit (9) having a feedback switchover function and a laser power supply control circuit, and is used for detecting laser output power of at least one processing point in real time, and outputting a negative feedback thereof to a control end of the laser power supply control circuit in real time, thereby implementing double-path power negative feedback, so as to control the laser output power. The system can significantly improve the laser output stability and the laser power control accuracy, obviously improve the laser processing quality, and effectively solve the problem of unstable output power caused by that a single power negative feedback closed-ring control system of a laser process device does not comprise a laser incidence unit (3), an optical fiber (2) and a laser emitting unit (5) of an output optical fiber coupling transmitting system.
DOUBLE-PATH POWER NEGATIVE FEEDBACK SYSTEM FOR LASER PROCESSING DEVICE