The invention provides a fin type evaporating pipe for a micro-engine combustor. A plurality of fin structures which are in the shape of a round hole or in the shape of the Arabic number 8 are arranged inside the fin type evaporating pipe. By additionally arranging the fin structures inside the evaporating pipe, the surface area of the inner wall can be increased, the contact area between a fuel oil and gas mixture and the evaporating pipe is increased, and the heat exchange effect is improved; furthermore, the flow rate of the fuel oil and gas mixture can be reduced to a certain extent, so that the dwell time of the fuel oil and gas mixture in the evaporating pipe is prolonged and the heat exchange effect is improved. The fins in the shape of a round hole enable the airflow velocity to be reduced and the dwell time of airflow in the evaporating pipe to be prolonged. The fins in the shape of the Arabic number 8 enable the surface area of the inner wall of the evaporating pipe to be increased. The two kinds of fins have their own advantages and can be arranged inside the same evaporating pipe, so that the optimal atomization-vaporization effect is realized. A good fuel oil atomization-vaporization effect enables combustion performance to be improved.