The invention belongs to the field of sewage treatment, and relates to a method and system for treating sewage by using a bound strengthened tidal stream artificial wetland. The system comprises a bound strengthened aerobic wetland bed body (10) and a carbon source replenishing type anaerobic wetland bed body (11), wherein the aerobic wetland bed body (10) consists of a plurality of small tidal stream artificial wetland columns and gaps, and is connected with a pretreatment unit (1) through a water distributing pipe (5); a water distributing pipe (6) is arranged at a water inlet part of the anaerobic wetland bed body (11), and a water distributing pressure divider (7) is arranged in the water distributing pipe (6) and is communicated with the pretreatment unit (1); and a siphon drain pipe (13) is arranged at a water outlet part of the system, and the height of the outlet is equal to that of a permanent submerged liquid level (12). The invention provides the method and system for treating the sewage by using the bound strengthened tidal stream artificial wetland to solve the problems that the tidal stream artificial wetland has shot stream phenomena in practical application, the bed body is poor in removal effect on nitrate and the like.