Mechanical arm capable of conducting accurate positioning and positioning method of mechanical arm

The invention discloses a mechanical arm capable of conducting accurate positioning and a positioning method of the mechanical arm. The mechanical arm capable of conducting accurate positioning comprises a mechanical arm body, a video system installed on the mechanical arm body and a visible light laser transmitter. The video system comprises a camera, a video transmission mechanism and a display device. A light path center axis of the camera is coaxial with the a clamping center line, in the direction of the mechanical arm body, of two clamping claws of the mechanical arm body; and the visible light laser transmitter is installed outside the light path center axis of the camera and is installed on the mechanical arm body through a rotating shaft perpendicular to the mechanical arm body, and the rotating shaft can conduct rotating and positioning according to needs. By means of the mechanical arm and the positioning method of the mechanical arm, a single-video accurate positioning system is installed on the mechanical arm of a robot to achieve accurate positioning clamping, a target object can be accurately positioned, in addition, operation is simple, and use is easy.