The utility model provides mine concrete wet spraying mechanical arm equipment. The mine concrete wet spraying mechanical arm equipment solves the problems that an existing spraying machine is not comprehensive in direction adjustment and not flexible, and spraying dead angles exist accordingly. The mine concrete wet spraying mechanical arm equipment comprises a vehicle body, a crawler walking mechanism is arranged on the bottom of the vehicle body, an operating floor, an oil supply driving mechanism and a mechanical arm are arranged on the vehicle body, the mechanical arm comprises a big arm and a telescopic arm, the big arm is hinged to the telescopic arm, a slewing hydraulic motor is assembled to the bottom of the big arm, an amplitude variation oil cylinder is arranged between the big arm and the telescopic arm, the locating end of the amplitude variation oil cylinder is hinged to the big arm, the telescopic end of the amplitude variation oil cylinder is hinged to the telescopic arm, the front end of the telescopic arm is connected to a left and right spiral tilt cylinder, the front end of the left and right spiral tilt cylinder is connected to a front and right spiral tilt cylinder, the front and right spiral tilt cylinder is provided with a cycloid hydraulic motor, and the cycloid hydraulic motor is connected with a nozzle through a universal joint. The mechanical arm is easy to control, the positions and angle postures of the nozzle can be changed flexibly, and accurate guniting work can be completed; the working distance and the spraying angle can be maintained continuously, and springback phenomena can be reduced.