The utility model relates to an asymmetric down-the-hole drill bit, and belongs to a high-efficiency down-the-hole drill for mine engineering. The drill bit is arranged on an impacter, is used for drilling rocks with hardness higher than medium hardness and comprises a drill bit body, wherein a large plane and an annular inclined surface positioned at the periphery of the large plane are formed on the head of the drill bit body; the large plane is perpendicular to the axis of the drill bit body; a plurality of internal teeth and a plurality of air holes are formed on the large plane; and a plurality of side teeth and a plurality of powder discharge grooves are formed on the annular inclined surface. The drill bit is characterized in that seven side teeth and seven powder discharge grooves are uniformly distributed on the annular inclined surface at intervals; two air holes are formed at the same circumferential position of the large plane; a powder discharge chute is connected between the center of each air hole and the adjacent powder discharge groove; the axis of the powder discharge chute passes through the center of the large plane; and an included angle between the axes of two rows of powder discharge chutes is 154.29 degrees. Due to the asymmetric layout of the air holes and the internal teeth, the internal teeth and the side teeth are slightly worn, and the service life of the drill bit is prolonged.