The invention provides a gauge adjuster and components thereof, and mainly relates to the field of railway repair machinery equipment. The gauge adjuster is provided with a telescopic device, so thatthe distance between two fastenings is shrunk and adjusted flexibly and quantitatively, thereby adjusting the distance between two rails connected with the fastenings in an abut mode. The gauge adjuster replaces manual work, improves work efficiency and adjustment accuracy, and reduces work intensity of workers. Lifting and pulling handles are arranged on the tops of each of the fastenings, and lifting handles are arranged on a connecting rod, so that the movement and use convenience of the gauge adjuster are improved. A U-shaped guard plate matched with a compression rod is arranged on the connecting rod of the telescopic device to achieve the limiting and fixing of the compression rod, so that the tightening of the compression rod and pressure maintaining effects of a subsequent cylinderare easily achieved. The gauge regulator and the components thereof have important promotion and application values.