Abstract: A magnetic coupler for isolating noise and vibration transmitted from a drive source on a six-axles CNC gearset testing machine used to test degrees of noise and vibration is provided. The magnetic coupler for isolating noise and vibration transmitted from a drive source on a six-axles CNC gearset testing machine includes a drive source, a drive shaft, a transmission member for operatively interconnecting the drive shaft and the drive source, and a gearbox having an input shaft; a magnetic coupler comprising an outer cylinder and an inner cylinder adapted to dispose in the outer cylinder and space therefrom; a first chuck adapted to couple the inner cylinder and the input shaft of the gearbox to be tested together, and a second chuck adapted to couple the outer cylinder and the drive shaft together. From the above, noise and vibration would not transmitted from the drive source to the gearbox (e.g., motorcycle gearbox) during the test.