Rectangular pipe joint overturning protection lifting appliance

The utility model provides a rectangular pipe joint overturning protection lifting appliance which comprises a group of pin-shaft-free inner frames and a group of pin-shaft-provided outer frames which are arranged in parallel, and the tops and the bottoms of the pin-shaft-free inner frames and the pin-shaft-provided outer frames are respectively assembled into a whole through a connecting bridge. A space for fixing a rectangular pipe joint is formed between the inner frame without the pin shaft and the outer frame with the pin shaft, and the center of the outer frame with the pin shaft is provided with the pin shaft for fixing the rectangular pipe joint. The turnover device is simple in structure, is matched with hoisting equipment, can realize quick turnover of the rectangular pipe joint under the condition that a turnover frame and the hoisting equipment are not additionally arranged and a lifting appliance is used, solves the problem of turnover of the pipe joint in a narrow space, is high in turnover perf