The invention relates to an FFS radome machining method and machining device based on a multi-degree-of-freedom laser robot. Firstly, model design of an FFS radome is conducted through three-dimensional modeling technology, a to-be-machined conformal metal radome body is obtained through a spinning forming process, and then machining of all FFS unit structures is achieved through track control of the laser robot combined with a double-degree-of-freedom mobile platform. Laser non-contact focusing is achieved through a CCD image sensor. The FFS radome machining method and machining device have the beneficial effects that a laser non-contact machining mode is adopted, the machining process does not produce a stress effect on the radome body, the universality is high, machining of all the FFS unit structures can be completed in a machining cycle, and the work efficiency is high.