The invention relates to a liquid circulating backflow spraying device. The liquid circulating backflow spraying device comprises an input opening and a backflow opening, and the input opening is connected with a short pipe A. The two ends of the short pipe communicate with the input opening and a U-shaped pipe B correspondingly, and a plurality of air pressure type liquid switching valves are evenly arranged on the short pipe A. The two ends of the U-shaped pipe B communicate with the short pipe A and a long pipe correspondingly. The two ends of the long pipe communicate with the U-shaped pipe B and a U-shaped pipe A correspondingly, and a plurality of air pressure type liquid switching valves are evenly arranged on the long pipe. The two ends of the U-shaped pipe A communicate with the long pipe and the short pipe A correspondingly. The two ends of the short pipe B communicate with the U-shaped pipe A and a backflow opening correspondingly. Spraying heads are arranged on the air pressure type liquid switching valves, and the air pressure type liquid switching valves independently communicate with a control platform, and connecting channels between the air pressure type liquid switching valves and the control platform are arranged in restraining pipes. Openings of the spraying heads are arranged downwards. The liquid circulating backflow spraying device has the beneficial effects of being simple in structure, convenient to operate, controllable in spraying, convenient to adjust, low in cost and practical in function.