The invention discloses a mobile iron scrap transfer system which is used for truck loading of iron scrap without landing. A hydraulic lifting mechanism is installed on a sealing type tip lorry, an iron scrap trolley is hung on a hook of the hydraulic lifting mechanism, and a hydraulic control system is arranged on the sealing type tip lorry. The iron scrap trolley receives iron scraps on one side of a machine tool and is pushed to a position near by the sealing type tip lorry, non-landing truck loading of iron scraps is achieved, no iron scrap stacking place is required, only one person is required during the truck loading process, other auxiliary staffs for assembly and disassembly are not required, the manual cost is saved, only more than 40 minutes is required for loading the lorry with iron scraps of 13 cubic meters, the iron scraps can be loaded in places where vehicles can be parked, operation can be achieved on sides of roads and on workshop passageways, after loading, the iron scraps can be delivered to recycling departments, the efficiency is high, by the aid of the processing method with a low cost, the high investment, high labor intensity and high manual cost in the iron scrap cleaning process and the environmental pollution caused by iron scrap transfer are avoided, and the system is significant to land conservation and environmental protection.