In order to simplify the modeling process of propeller blade, according to the twodimensional drawing principle and geometric features of propeller blade, an automatic modeling method of propeller blade is proposed. The Python language is used to compile the execution program and software operation interface, to establish the automatic modeling software of propeller blade with simple operation, simple interface and fast calculation, and to realize the automation of data transfer and modeling between Excel and CATIA. Through the software operation interface, the friendly interaction with users is achieved.