The invention discloses a method for promoting rejuvenation of a littoral saline and alkaline wetland, comprising the following steps of: deeply plowing the littoral saline and alkaline wetland to be rejuvenated, wherein plow scratching depth is 15-30 centimeters and preferably 25 centimeters, and a plowing distance is 50-80 centimeters and preferably 50 centimeters; after the deeply plowing step, also irrigating papermaking waste water into the littoral saline and alkaline wetland, wherein the COD (Chemical Oxygen Demand) value of the papermaking waste water is 200-800 mg/L and preferably 600 mg/L, the irrigating depth of the papermaking waste water is 5-30 cm and preferably 30 cm, irrigating time is 1-4 times every month and preferably 2 times, and dry is seen every time. The method is suitable for the littoral saline and alkaline wetlands with various degradation degrees, such as slightly, moderately and severely degraded littoral saline and alkaline wetlands, can enable the ecological environment conditions of rejuvenated wetland areas to be greatly improved by being utilized to rejuvenate the littoral saline and alkaline wetlands and has important application value.