The working of mine wet shotcrete machine were introduced and the main mechanisms of the general structure and composition of the shotcrete machine pumping system were analyzed. According to the practical requirements，the structure sizes of the hydraulic system were calculated and its structure chart was drawn. In the case of meet the theoretical requirements, the total hydraulic principle diagram of the wet shotcrete machine was designed.The productivity is improved and the shotcrete area and distance are expanded when pumping structure is adopted.