Shotcrete machine are divided into dry mix shotcrete machine and wet mix shotcrete machine according to different processes. For dry mix shotcrete machine, mechanical structure is simple, mechanical cleaning and fault handling is relatively simple; Compared with dry mix shotcrete machine, small dust, low rebound, greatly reducing the dust concentration at the construction site, which greatly reduces the health of workers harm. Besides, Concrete homogeneity is good, high strength. Usually, dry mix machines are mostly used to open up and open air workplaces, while wet mix shotcrete machine is used for tunnel, mine etc. relatively confined environment.