Mechanical arm and robot

The invention discloses a mechanical arm which comprises two arm components connected with each other through a rotating shaft in a rotatable manner, and a drawing wire fixedly connected with one arm component in way of surrounding the rotating shaft, wherein the rotating shaft is basically vertical to the length direction of the arm component. According to the mechanical arm provided by the invention, the drawing wire can be pulled to make the arm component connected with the drawing wire rotate relatively to the other arm component; under such condition, a driving device for pulling the drawing wire can be arranged outside the mechanical arm, but not limited to the rotatable joint of the two arm components, so that the weight of the mechanical arm is reduced, and the structure of the mechanical arm is simplified; meanwhile, under the pulling of the drawing wire, one arm component can swing around the other arm component to realize swing control. The invention further discloses a robot which comprises the me