The invention belongs to the field of bottle blowing machines and discloses a method for controlling the preform temperature of the bottle blowing machine. The method comprises the followings steps of: 1) initialization, namely presetting furnace temperature value and a bottle perform temperature allowable range value in a controller; 2) temperature acquisition, namely receiving temperature values of a heating furnace and the bottle perform which are acquired by a temperature sensor by virtue of the controller; 3) calculation, namely carrying out PID (proportion integration differentiation) operation on the acquired temperature values and the preset value by virtue of the controller; and 4) regulation, namely outputting a regulating signal to control the power of an infrared lamp tube of the heating furnace by the controller according to the result of the PID operation. In the invention, PID operation is adopted for control, the reaction speed of computing control is fast, and the accuracy is high; and compared with the tradition control accuracy, the processing quality of a product can be greatly improved and the yield of the product can be improved while the heating temperature control accuracy is improved, thus the bottle blowing machine can produce thinner and larger bottle bodies by blowing, and resource can be saved.