Fixed-scale speckles are used in existing ghost imaging system, while the current instrument can achieve multi-scale speckles ghost imaging. It focuses on the research of compressed sensing ghost imaging system using multi-scale speckles. Through the computer simulation and using the four resolution scales’ image as the original image, restored images were obtained to analyse a variety of different scales and different proportion of speckle cases. The results show that the compressed sensing ghost imaging system using multi-scale speckles can obtain image which is close to the true value. And when the small scale speckles occupy large proportion, the recovered image resolution is not disturbed.