The invention relates to a household gas cooker and particularly relates to a flower petal type combustor. The combustor comprises a fire hole base, a gas mixing chamber, a base, an injection pipe and a nozzle, wherein the nozzle is inserted into one end of the injection pipe and the other end of the injection pipe is fixedly connected with one end of the base; the other end of the base is fixedly connected with the bottom of the gas mixing chamber; the fire hole base is mounted at the upper part of the gas mixing chamber; flower petal type fire holes are distributed above the fire hole base; and the fire holes are regularly distributed in the peripheral direction. The flower petal type fire holes are adopted; compared with common fire holes, the injection capability is strong and the injection coefficient is great; when the flow of fire hole outlets is certain, more air can be sucked so that the efficiency of the gas cooker is improved, the heating is more uniform and the heat absorption efficiency is higher; and the combustion efficiency can be greatly improved, the emission of CO and NOx can be reduced, and the national energy-saving and environmentally-friendly standards are achieved.