The invention discloses a binary ultrasonic speed air incoming way having drainage air gaps. The binary ultrasonic speed air incoming way comprises an outer wall face, an inner wall face, a front bodycompression face extending forwards from the inner wall face and two side wall faces in symmetric arrangement, and an inner passage and an expanding section are formed among the outer wall face, theinner wall face and the two side wall faces. The binary ultrasonic speed air incoming way is characterized in that one or multiple drainage air ways are symmetrically arranged on each side wall face and penetrate the same. The discharge air gaps are formed in the side wall face, and pressure difference inside and outside the air incoming way is utilized to discharge part of boundary layer low-energy flow and even separation packets on the side wall faces to the outside of the side wall faces of the air incoming way, so that a boundary layer of an air incoming way flow field on each side wall face is thinned, impact of the side wall face boundary layer on a compression face flow field is reduced, total pressure recovery coefficient and flow coefficient of the air incoming way are effectively improved, and performance of the air incoming way is improved.