The invention discloses a mechanical arm operating platform applicable to a robot. The mechanical arm operating platform comprises a base and a pedestal, wherein the pedestal is arranged at the top of the base and can rotate in a horizontal plane around an axis of the base; the pedestal is sunk from the top down to form a plurality of mounting pipes; cavities with two opening ends are formed in the mounting pipes; workpiece to be machined are assembled in the cavities; elastic mechanisms are arranged between the workpieces to be machined and the tops of the cavities; a telescopic mechanisms is arranged below the pedestal; and the telescopic mechanism can drive a telescopic rod at the top to enter the cavities from the lower ends of the cavities to allow a mechanical arm to machine different parts of the workpieces to be machined. The mechanical arm operating platform applicable to the robot can ensure that the mechanical arm can machine different positions of the workpieces to be machined at the same time.