Rotary arm supporting structure of robot

The invention provides a rotary arm supporting structure of a robot. According to the rotary arm supporting structure of the robot, a supporting structure is arranged at the bottom of an original rotary arm, so that the rigidity of the rotary arm is enhanced, and the corresponding load capacity of the rotary arm is improved. The rotary arm supporting structure comprises a fixed base. A rotary shaft mounting base is fixedly arranged on one side of the fixed base in the vertical direction. A power driving device is arranged in an inner cavity of the rotary shaft mounting base. The input end of the rotary arm is fixedly connected with a first rotary shaft. The output end of the power driving device is fixedly connected with the lower convex end of a first rotary shaft. The rotary arm supporting structure is characterized in that the bottom of the rotary shaft mounting base is provided with a second connecting seat; a rotary shaft mounting hole is formed in the position, under the first rotary shaft, of the secon