The utility model relates to a triple tube rotary jet grouting reinforcement system which comprises a machine frame, a drilling machine, a drilling rod, a lifting motor, a spray head, a high-pressure water pump, a slurry pump, an air compressor, a water tank, a mixer and a cement bin. The drilling machine is fixed onto the machine frame. The drilling rod is connected onto the machine frame in a pivoted mode and driven by the drilling machine to rotate. The lifting motor is installed at the top of the machine frame and connected to the top of the drilling rod. The spray head is arranged at the bottom end of the drilling rod. The high-pressure water pump, the slurry pump and the air compressor are connected onto the drilling rod respectively. The water tank is connected onto the high-pressure water pump and the mixer. The cement bin, the mixer and the slurry pump are sequentially connected. The triple tube rotary jet grouting reinforcement system has the advantages of being simple in structure, good in construction safety, short in cycle, low in cost and the like, soil mass reinforced through the triple tube rotary jet grouting reinforcement system is very high in strength and good in impervious performance, and the triple tube rotary jet grouting reinforcement system is particularly suitable for construction of stratum which is mainly formed by clay, floury soil and sandy coil and meanwhile is abundant in underwater.