The invention provides a structural design scheme for a mini type engine combustion chamber flame barrel with air inlet flow guiding blades. The air inlet flow guiding blades are arranged at the position, close to the front end of the flame barrel, of a flame barrel shell, so that airflow entering the flame barrel through a main combustion hole has the component of velocity in the axial direction,the radial direction and the circumferential direction, a backflow area can be formed by the rotation airflow in the flame barrel, the airflow structure in the flame barrel is effectively improved, the airflow speed is reduced, and the combustion stability of a mini type engine combustion chamber is improved; and due to existence of the backflow area, the airflow turbulivity is improved, fuel oiland fresh air mixing is more sufficient, combustion is safer, and the combustion efficiency is greatly improved.