The embodiment of the utility model discloses a robot system with a twisting leaking stoppage mechanical arm end effector. The robot comprises a mechanical arm end effector used for twisting plugging,a robot chassis, a crawler walking mechanism, a control cabinet, a mechanical arm, a holder mechanism and a camera. The crawler walking mechanisms are arranged on the two sides of the robot chassis.Wherein the control cabinet is installed at the rear end of the robot chassis, the camera is installed on a cradle head mechanism arranged in the middle of the robot chassis, the mechanical arm is arranged at the front end of the robot chassis, and the tail end of the mechanical arm is connected with the mechanical arm tail end executor and used for conducting twisting plugging on a leakage pointof leakage equipment. By the adoption of the mechanical arm end executor, the mechanical arm end executor can be suitable for leaking stoppage of leaking points of pipelines of different sizes, a robot system composed of the mechanical arm end executor has the functions of autonomous navigation and obstacle avoidance, and leaking stoppage operation can be accurately, flexibly and efficiently executed.