Working arm height limiting device

The invention discloses a working arm height limiting device, and belongs to the technical field of engineering machinery. The defects that according to working arm height limiting devices in the prior art, mechanical height limiting devices are poor in applicability, and electronic height limiting devices are high in cost and poor in feasibility and reliability are overcome. The working arm height limiting device mainly comprises a first rotating arm and a second rotating arm, and further comprises a limiting oil cylinder. The limiting oil cylinder comprises a telescopic rod and a cylinder body, the telescopic rod is hinged to the first rotating arm, the cylinder body is hinged to the second rotating arm, the limiting oil cylinder is connected with an oil cylinder switch, the oil cylinderswitch controls the telescopic amount of the telescopic rod, and a hydraulic lock is arranged between the oil cylinder switch and the limiting oil cylinder. The device is used for height limiting ofmulti-section working arm