The invention discloses a shotcreting mechanical arm with a six-foot walking device. The shotcreting mechanical arm comprises a machine body. The machine body is provided with a chassis, a power device, a working device and a control system. The six-foot walking device is arranged on the lower portion of the chassis, the six-foot walking device comprises six walking legs, and each walking leg comprises an upper supporting leg, a lower supporting leg connected with the upper supporting leg and a transverse supporting leg connected with the upper supporting leg. The transverse supporting legs and the chassis are in rotating connection. The power device is arranged on the chassis, the power device comprises a motor and a hydraulic pump driven by the motor, and the hydraulic pump supplies power to the six-foot walking device and the working device. The control system is used for controlling the movement of an arm rest, the movement of a shower nozzle mechanism and the movement of the walking device. The shotcreting mechanical arm with the six-foot walking device is small and exquisite in complete machine, simple and compact in structure, flexible, capable of crossing large obstacles and particularly suitable for the occasions such as a mine laneway which has restrictions on working space.