The invention provides a fire leading channel of a rotor engine. The fire leading channel comprises a fire leading channel body. The fire leading channel body is arranged in a sparking plug installation hole in a cylinder body of the rotor engine and penetrates through the sparking plug installation hole. The fire leading channel body comprises two perpendicular grooves in the profile of the cylinder body, wherein one groove is parallel to the movement direction of airflow in the cylinder body of the rotor engine. The perpendicular grooves each comprise a rear wall face and a front wall face, wherein the rear wall face is an end face opposite to the airflow direction, the front wall face is an end face facing the airflow direction, the rear wall face and the front wall face are circular arc faces, and the circular arc diameter of the rear wall face is larger than that of the front wall face. According to the fire leading channel, a cyclone can be formed in the channel, flame is stabilized, fuel is sufficiently combusted, a heating piece achieves a heating effect to increase the temperature in the channel, liquid fuel is rapidly evaporated, and combustible mixed gas is rapidly formed.