FIELD: towing devices. SUBSTANCE: invention relates to towing devices of road trains completed with single-axle trailers. The mechanism for stabilizing the rectilinear movement of a single-axle trailer contains a traction lever made in the form of a square tube, in the inner cavity of which a compression spring is located. In the inner cavity of the lever, a longitudinal U-shaped bracket is installed with the possibility of being pressed by a compression spring, resting with its front part against the support platform of this bracket, located in the vertical transverse plane of the traction lever, and with its rear part resting against a collar made on the inner surface of the traction lever. In the horizontally located eyelets of the U-shaped bracket, a cylindrical roller is installed with the possibility of rotation on the vertical axis, and on the front part of the traction lever there is a turntable made in the form of a semi-cylinder, fixed on the traction lever with the possibility of angular rotations relative to the vertical kingpin, connected to the traction lever by means of fixed on this bracket arm. EFFECT: reduction of lateral horizontal oscillations of a single-axle trailer during rectilinear movement and not preventing the road train from making turns when maneuvering is achieved. 1 cl, 5 dwg.