The invention discloses an artificial wetland gas sampling apparatus capable of adjusting parameters and a determination method. The method comprises the following steps: A, pre-burying a sampling apparatus, burying a base at a preset point, covering plants, and enabling wetland water level to immerse the apparatus base; B, sampling gas, selecting a number of sampling barrels, determining a size of the sampling barrels, extracting a gas sample, storing the gas sample into a gas sample bag or syringe, and sending to a laboratory for determining; C, adjusting an artificial wetland operation condition according to a gas detection result, managing the operation of the wetland, actually measuring a content of greenhouse gas released into the environment while the wetland purifies the water, and providing evidence. A fixed base and the sampling barrels are fixed by virtue of base fixing nuts, the sampling barrels are stacked and connected by virtue of a sleeve, the sampling barrels are connected with the fixed base by virtue of the base, a choke plug is installed at the top of the apparatus, the choke plug is internally provided with a fan and a fan speed regulator, and an atmospheric pressure balance pipe of the fan speed regulator is connected with a power supply. The method is easy, simple in structure, convenient in use and capable of collecting gas released by the artificial wetland in real time.