The invention discloses a digitizing method of weather facsimile signals. The method mainly comprises the following steps: (1), converting analog signals into digital signals and transmitting the digital signals to an upper computer; (2), firstly, searching an image head corresponding to the received digital signals; (3), finding a row head of a corresponding image and continuously receiving corresponding image signals; (4), judging whether the whole signal receiving is finished or not, going to the step (5) if finishing the signal receiving and ending the whole receiving process and returningto the step (3) if not finishing the signal receiving; and (5), forming an image file according to the received image signals. The invention converts and stores the weather analog signals into the digital signals as a BMP file so as to be beneficial to the weather analysis of the whole course and provide data support for course construction.