NOVELTY - Waste water processing system for combined tidal flow artificial wetland comprises a non power automatic water charging device (9), an artificial wetland bed, and a non power automatic water discharging device (2).    USE - The waste water processing system is useful for combined tidal flow artificial wetland (claimed).    ADVANTAGE - Compared with conventional combined wetland, it increases waste water processing amount and reduces the construction cost.    DETAILED DESCRIPTION - Waste water processing system for combined tidal flow artificial wetland comprises a non power automatic water charging device (9), an artificial wetland bed, and a non power automatic water discharging device (2); the non power automatic water charging device (9) is located on the artificial wetland bed and is connected with the artificial wetland bed via siphon water inlet pipe (10); the artificial wetland bed is equipped with a water discharging layer (5), a denitrification reinforcing layer (7), a reinforcing reaeration layer (8) and an aerobic ecological sand layer (17); the non power automatic water discharging device (2) forms a connector along with the artificial wetland bed and is connected with it via bottom water discharging layer (5); the wetland plants are planted on the aerobic ecological sand layer (17), and the water distribution main pipe (13) and the water distribution branch pipe (14) on the bed body are paved on the sand layer of the plant zone; water inlet of the siphon water discharging pipe (3) in the non power automatic water discharging device (2) is flush with the bottom of the reinforcing reaeration layer (8) , and water outlet of the siphon water charging pipe (10) is located under the liquid surface (18) flush with the bottom of the water distribution main pipe (13) on the bed body. An INDEPENDENT CLAIM is a waste water processing method using the waste water processing system for combined tidal flow artificial wetland, where the waste water processing is carried out by tidal running way, and each running period comprises two steps of flooding absorption and emptying reaeration; the step of flooding absorption is as follows: the waste water in the non power automatic water charging device (9) is conveyed to the water distribution pipe on the artificial wetland bed via siphon effect, the waste water is seeped in non saturated way, the saturated dipping face of the artificial wetland bed is gradually lifted, in the process, the waste water is in contact with the microorganism membrane attached to the matrix and the surface, the absorption and interception of matrix and the microorganism membrane to pollutant is reinforced; the step of emptying reaeration is as follows: when the saturated dipping face of the waste water is lifted to the top of the aerobic ecological sand layer (17) of the artificial wetland bed, the non power automatic water discharging device (2) connected with the bottom of the artificial wetland bed starts discharging waste water by siphon way, the water is discharged to the dipping face and is returned to the bottom of the reinforcing reaeration layer (8), the liquid surface is quickly reduced on the dipping face, namely in the water discharging process, due to effect of water suction force in the gap of the matrix, gas-state oxygen in the atmosphere is quickly sucked in the bed body for aerobic decomposition and ammonia nitrogen oxidation of the microorganism to the organic matter, thus the effective use amount of the oxygen in the bed is increased.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the waste water processing system.    Wetland plant (1)    Non power automatic water discharging device (2)    Siphon water discharging pipe (3)    Liquid surface (4)    Bottom water discharging layer (5)    Liquid surface (6)    Denitrification reinforcing layer (7)    Reinforcing reaeration layer (8)    Non power automatic water charging device (9)    Siphon water inlet pipe (10)    Liquid surface (11, 12, 18)    Water distribution main pipe (13)    Water distribution main pipe (14)    Water distribution branch pipe (15)    Aerobic ecological sand layer (17)