The invention relates to the technical field of telescopic arms, and discloses a telescopic arm lubricating and oil accumulation preventing device. The device comprises an outer arm, a protruding block is fixedly installed on the inner wall of the outer arm, an inner arm is slidably connected into the outer arm, an ejector block is slidably connected to the surface of the inner arm, a dielectric substance is fixedly installed at the front end of the ejector block, an ejector rod is fixedly installed outside the ejector block, electrode plates are fixedly installed on the left side and the right side of the ejector rod, an electromagnet is fixedly installed at the end, away from the outer arm, of the ejector rod, and spring rods are fixedly installed on the left side and the right side of the end, away from the outer arm, of the ejector rod. According to the telescopic arm lubricating and oil accumulation preventing device, when the telescopic arm works, atomized oil is automatically sprayed to the interior of the telescopic arm, the spraying area is wide, spraying is uniform, when too much oil is accumulated in the telescopic arm, the internal oil is sucked into an oil cavity to complete circulation, the lubricating oil can be repeatedly used, and resources are greatly saved.