The invention discloses a universal chassis capable of accurately achieving longitudinal and transverse linear traveling through a control connecting rod. The universal chassis capable of accurately achieving longitudinal and transverse linear traveling through the control connecting rod comprises a chassis base and universal wheels. The tops of supporting shafts of the universal wheels are connected with bearings fixed to the chassis base. The middle portion of each supporting shaft is a thin shaft, wherein an upper shaft shoulder and a lower shaft shoulder are arranged at the top and the bottom of the thin shaft correspondingly, and the outer diameters of the upper shaft shoulder and the lower shaft shoulder are larger than the outer diameter of the thin shaft; the upper shaft shoulder and the lower shaft shoulder are each provided with a vertical section, and the vertical section of the upper shaft shoulder is perpendicular to the vertical section of the lower shaft shoulder. The supporting shafts are connected with the control connecting rod provided with a frame-shaped rack. The supporting shafts are sleeved with the frame-shaped rack of the control connecting rod. When the frame-shaped rack is located on the thin shafts, rotation of supporting shafts is not hindered. When the frame-shaped rack is located on the upper shaft shoulders or the lower shaft shoulders, rotation of the supporting shafts can be limited through the close fit of the inner side faces of the frame-shaped rack and the vertical sections, and the control connecting rod is fixedly connected with the chassis base through a locking mechanism. According to the universal chassis, accurate control over the traveling direction can be achieved under the condition that the inherent characteristics of the universal chassis are guaranteed.