The invention discloses a gas turbine low-emission combustion chamber using gas fuels, and belongs to the technical field of gas turbines. The combustion chamber comprises an on-duty grade, a main combustion grade, a high-pressure igniter, a mixing hole, an exhaust outlet, a bearing machine box, a flame cylinder, the flame cylinder outer machine box, a flange, a first on-duty grade gas fuel pipeline, a main combustion grade gas fuel pipeline, a main combustion grade fuel main pipe, a first on-duty grade fuel main pipe, a pipeline bracket, a second on-duty grade fuel main pipe, a second on-dutygrade gas fuel pipeline, an air conditioning device, a first on-duty grade fuel tank, a second on-duty grade fuel tank and a main combustion grade fuel tank; when a gas turbine is started in low-loadstates, only the on-duty grade works; when the gas turbine is started in high-load states, the on-duty grade and the main combustion grade work together; and through diffusion combustion of on-duty grade fuels, a stable ignition source is provided to a main combustion area, so that the low emission requirement is guaranteed, the combustion stability and the combustion efficiency are fully considered, and the performance requirements of the combustion chamber are comprehensively met.