This paper presents a novel method for dimension measurement of large-scale moving objects using stereo camera with 2-degree of freedom mechanism. The proposed method utilizes both the advantages of stereo vision technique and the enlarged visibility range of camera due to 2-DOF rotary mechanism in measuring large-scale moving objects. The measurement system employs a stereo camera combined with a 2-DOF rotary mechanism that allows capturing separate corners of the measured object. With the simple and flexible structure, the proposed measuring system can measure the dimensions of moving objects, which have diverse shapes, with relatively slow and steady speed. To verify the feasibility of the proposed measuring system some experiments are carried out. Finally, it is concluded that the proposed system guarantees high measuring accuracy.