The invention discloses a tunnel face cavity processing method for shield tunnel construction. The tunnel face cavity processing method for the shield tunnel construction includes steps that 1, primary grouting, to be specific, using a grouting system to fill first cement mortar to the lower part of the cavity from the top to bottom through a soil warehouse, wherein the first grouting size is composed of cement, bentonite, coal ash, sand and water according to the weight ratio of 45-55: 45-55: 180-220: 540-660: 360-440; 2, secondary grouting, to be specific, using the grouting system to fill second cement mortar to the middle of the cavity, wherein the second cement mortar is composed of cement, bentonite, coal ash, sand and water according to the weight ratio of 90-110: 68-82: 200-280: 540-660: 420-500; 3, tertiary grouting, to be specific, using the grouting system to fill cement slurry to the upper part of the cavity. The tunnel face cavity processing method for the shield tunnel construction is simple in steps, reasonable in design, easy and convenient to operate, low in invested cost, good in use effect and capable of solving the problems of a traditional grouting strengthening method.