The edges of machined parts usually produce burrs, which affect the use of parts. In order to remove burrs from parts, a 800 W fiber laser with a wavelength of 1 064 nm and a pulse width of 200 ns was used to deburr the edges of six series of aluminium alloys. Laser cutting is to melt and evaporate the irradiated surface by the energy released when the laser beam irradiates the workpiece, so as to cut the workpiece. This characteristic can be used to cut the big burr of the workpiece. Secondly, the energy density can be reduced by changing the size of laser spot, so that the irradiation surface can only melt without evaporation, and the melting fillet can be realized. Based on the above two points, the deburring effect of aluminium alloy parts was experimentally studied. The influence of laser power, scanning speed, scanning times and defocusing amount on deburring quality and the weight of each parameter are studied. The optimum parameters are obtained as follows: laser power 560 W, scanning speed 50 mm/s, focal position 3mm and laser power 640 W, scanning speed 60 mm/s and focal position 3 mm. It can remove parts burrs and melt round corners.