The utility model discloses a maloperation-wounding preventing device for a low-level mounted air-supply safety valve. The maloperation-wounding preventing device comprises a valve body, a spring chamber, a spring component and an exhaust pipe, wherein an auxiliary exhaust pipe is arranged below the exhaust pipe and leads an exhaust port into a safety area through a pipeline, and a square elbow is mounted on the exhaust pipe. The square elbow is provided with a flared opening. When pressure in a pressure container slightly exceeds the standard but is not high, the auxiliary exhaust pipe is capable of safely exhausting air. When pressure in the pressure container is excessively higher than the standard, the auxiliary exhaust pipe is capable of releasing partial pressure and thereby reducing total pressure of exhaust air. At this time, the square elbow mounted on the exhaust pipe after pressure reduction can change flow direction, and direct impact to human body is avoided. When operators overhaul air exhausting, the operators have no need to worry about spiritual pressure when high-pressure air faces the human body, the problem of wounding risk from the high-pressure air is basically solved, personnel life safety is ensured, safety coefficient of the operators is greatly increased, and risk of damages to peripheral equipment is reduced.