The invention discloses an automatic graph drawing method for a reluctance type rotary transformer. The method comprises the following steps: selecting a stator slot type of the transformer, and inputting the structural parameters of the transformer; calculating key parameters of a CAD graph of the transformer according to the stator slot type and the input structural parameters of the transformer; and writing a calculation result of the key parameters of the transformer CAD graph into a CAD graph file. By means of the method, after a user inputs the transformer structure parameters into the computer, the CAD graphic file can be directly obtained through key parameter calculation. The CAD drawing software does not need to be opened. The universality is extremely high. The hard disk space occupied by programs is very small. The drawing work can be completed within one minute, and the work efficiency is greatly improved.