Telescopic arm

The utility model provides a telescopic arm which comprises a large arm and a small arm and oil cylinders. The large arm comprises a connecting end and an opening end. The telescopic arm is characterized in that a cavity is formed along the opening end direction, and the oil cylinders are connected on the outer wall of the cavity. The small arm comprises an oil cylinder connecting frame, a working end and a sliding end. The sliding end extends into the cavity, and the oil cylinder connecting frame is arranged on one portion, close to the working end, on the small arm, and the oil cylinder connecting frame is connected with the oil cylinders. Due to the fact that a telescopic structure is adopted by the telescopic arm, working scope of the large arm is prolonged. According to engineering machinery taking the telescopic arm as a large arm, working face can be enlarged under the condition that posture positions of a base disc and a rotator are not adjusted, working scope is enlarged compared with traditional mac