The invention provides a method for automatically locating and moving a binocular vision mechanical arm for weight testing. A camera is calibrated, and a feature template is determined; the camera collects an image of a weighing apparatus centring disc, an image of a weight to be tested and an image of a mechanical arm tail end clamp, and feature graphs matched with the feature template are found from the obtained images; the positions of the feature graphs under a pixel coordinate system are calculated and converted into positions under a fixed coordinate system; a first path is generated according to the positions of the tail end clamp and the weight to be tested, and the mechanical arm completes the work of clamping the weight to be tested according to the first path; a second path is generated according to the positions of the weight to be tested and the weighing apparatus centring disc, and the mechanical arm moves the weight to be tested to the target point of the weighing apparatus centring disc according to the second path. Locating precision can be improved, the carrying efficiency of the weight can be improved, labor cost can be lowered, and impact damage to a weighing apparatus is avoided.