The invention discloses an automatic hooking device of a freight ropeway. The automatic hooking device comprises a walking mechanism, a hook self-locking mechanism, a material barrel mechanism, an installation platform and a limiting mechanism; the material barrel mechanism comprises a material barrel and a hanging ring part, the hook self-locking mechanism comprises a connecting plate, a hook and a self-locking part, the installation platform comprises a horizontal platform and a positioning part, the positioning part comprises multiple positioning stop blocks and a baffle part arranged on one side of the horizontal platform, the hanging ring part comprises two rotating arms, a cross beam and a hanging ring, and the cross beam is provided with an eccentric self-locking device for positioning the hanging ring. The automatic hooking device is simple in structure, reasonable in design, high in adaptability and good in positioning effect, the material barrel mechanism is precisely positioned, automatic feeding and discharging are achieved, the feeding hooking action and the discharging action are accurate, the labor intensity of workers is reduced, and the construction efficiency and safety of electric power transmission are improved.