The invention relates to a scalable arm-type dump height loading and unloading truck which consists of a car body 1 and a scalable hanger arm 2, and is characterized in that: the scalable hanger arm is provided with an amplitude hydrocylinder 4 which is provided with a scalable supporting arm 7, and the bottom of the amplitude hydrocylinder 4 is connected with a bracket 5, and the other end of thebracket 5 is connected with the car body 1 by a hinge mechanism; meanwhile, an adjust tilt jack 6 which can lift the bracket 5 upward is arranged at the position of the bracket 5 where is close to the hinge mechanism. Owing to the use of the scalable hanger arm in the goods loading and unloading lifting arm, the effective lifting height reaches near to10 meters, and the effective front-extensionhorizontal distance also reaches near to10 meters; therefore, not only the loading and unloading goods can be lifted to any height among 6-10 meters effectively, the loading and unloading in a plurality of dead spots, such as, warehouses and the cabins of the steamboats are also provided with handy equipments.