This study discusses the application of digital image to hair styling of cosmetology styling, which adopts literature discussion and experimental innovation method. According to experiment and comparing result, we found: digital image has good practical and teaching supportive effect to image processing and simulation in respect of various hairstyle combinations, hair cutting, hair dye, design and creation. For the beauty industry emphasizing on visual image, applying image access, edit, adjustment and special effect such functions to process image changes mixed by multiplayer pixels on identical image not only can enhance the image quality, but also can integrate multiple image processing. Moreover, it replaces the physical hair design method in the past, which is very economic by saving time and labor, meanwhile creating sensitive and precise art effect.