Aiming at the detection of grinding burn of high performance bevel gear after grinding, the automatic detection device for grinding burn of bevel gear tooth surface is developed. The detection device is composed of mechanical structure, Barkhausen noise detection module and test software. The detection device completely relies on the mechanical system and electrical system of bevel gear tester to realize automatic detection. The mechanical structure shares fixture with gears, by introducing flexible shaft design, which can meet the requirements of a variety of bevel gear detections. And the detection process of spiral bevel gear can be simplified. AST RollScan350 magnetic elastic instrument is employed to collect the Barkhausen noise signal of measured bevel gear. The collected signals are analyzed using detection software run in the host computer. Experimental results indicate the high repeatability of the detection device for quality control in gear production．