The invention discloses a maintenance technology for liquid foam in a concrete inner-layer well wall of a freezing shaft. The maintenance technology for liquid foam in the concrete inner-layer well wall of the freezing shaft comprises the following steps that 1 foam original solution is prepared; 2 an inner wall template on the concrete inner-layer well wall of the freezing shaft is dismantled; 3 the foam original solution prepared in the step 1 is made into foam solution; 4 the foam solution prepared in the step 3 is made into foam, and a foam maintenance device is used for covering the concrete inner-layer well wall of the freezing shaft. According to the maintenance technology for the liquid foam in the concrete inner-layer well wall of the freezing shaft, the maintenance condition of the inner wall concrete is improved to a great extent, the generation of temperature crack in the concrete inner-layer well wall of the freezing shaft can be reduced or controlled effectively, the quality of the freezing shaft is improved, water for the maintenance of the concrete inner-layer well wall of the freezing shaft can also be saved, and the maintenance energy consumption of the concrete inner-layer well wall of the freezing shaft is reduced.