The invention discloses a safe operation limit diagram drawing method for a doubly-fed asynchronous generator. The method comprises the following steps: selecting each original rotating speed and eachoriginal active power corresponding to a plurality of test points from a pre-generated rotating speed power curve of a to-be-tested generator; adjusting the rotating speed of the to-be-tested generator to the original rotating speed corresponding to each test point, and adjusting the active power of the to-be-tested generator to the corresponding original active power; respectively adjusting thereactive power of the to-be-tested generator to the maximum reactive power of the total outlet of the network surfing side according to each original active power so as to take the maximum reactive power as the target reactive power of the generator, and recording each target reactive power; and drawing a curve graph of the original active power and the target reactive power according to the original active power and each target reactive power. Reactive power of the generator is adjusted according to the curve graph, and flexibility and utilization rate are improved. In addition, the inventionalso discloses a safe operation limit diagram drawing device for the doubly-fed asynchronous generator, have the above effects.