The utility model discloses a directly spout formula combustion chamber, including combustion chamber main part, two (air) intake valves, two exhaust valves, a spark plug and a sprayer, wherein, the top profile of combustion chamber main part is including relative first inclined plane and the second inclined plane that sets up, two (air) intake valve interval ground sets up on the first inclined plane, two exhaust valve interval ground sets up on the second inclined plane, wherein, following the (air) intake valve extremely in the direction of exhaust valve, first inclined plane is tilt up gradually, the downward sloping gradually of second inclined plane, the spark plug sets up the middle part of top profile, the sprayer sets up on first inclined plane. The utility model provides a directly spout formula combustion chamber has improved gaseous flow performance in the main part of combustion chamber, and then has improved the burning behavior of combustion chamber for gaseous and oil can fully burn fast, has practiced thrift the energy.