The invention discloses a rotating arm crane pipe for loading hydrochloric acid and belongs to the technical field of crane pipes. The rotating arm crane pipe comprises a supporting frame component, a rotating arm component, a hydraulic cylinder, a vertical pipe, a sealing cap, an extensible pipe, a liquid level meter, a gas-phase hose and a liquid-phase hose, the supporting frame component comprises an upright, a support, a bracket, a supporting column, a rotary supporting seat, a first rotating joint and a first pneumatic motor, the rotating arm component comprises a first elbow, an inner arm, a second elbow, a second rotating joint, a second pneumatic motor, a vertical arm, a third elbow and an outer arm, polytef is lined in the vertical pipe, and the extensible pipe which downwards penetrates the sealing cap and is made by polypropylene is arranged in the vertical pipe in a sleeved manner. The rotating joints are driven to rotate through the pneumatic motors, so that accuracy in alignment is realized, rotating angle of the hoses is reduced, and service lives of the hoses are prolonged; the polytef is lined in the vertical pipe and used for making the liquid-phase hose and the gas-phase hose, so that the circumstance that a rubber pipe is prone to embrittlement and breaking leading to acid leakage when being corroded by the acid for a long time is avoided.