The invention provides a construction method for an inter-wall grouting water-resisting and reinforcing well wall structure under protection of a freezing wall, and belongs to construction methods for inter-wall grouting water-resisting and reinforcing well wall structures. The construction method for the inter-wall grouting water-resisting and reinforcing well wall structure under protection of the freezing wall comprises the steps that the grouting opportunity under the protection of the freezing wall is selected actively; a grouting pipe is embedded between an inner wall and an outer wall while the inner well wall is constructed; after construction of the inner well wall is completed and before the freezing wall is melted, grouting is conducted between the inner well wall and the outer well wall from the ground under the protection of the freezing wall; and the space between the inner well wall and the outer well wall is blocked actively, so that the grouting protection effect is improved, the water sealing effect of the outer well wall is sufficiently improved, and the combined bearing effect of the inner well wall and the outer well wall is brought into play. The construction method for the inter-wall grouting water-resisting and reinforcing well wall structure under protection of the freezing wall has the advantages that the grouting pressure is low, and compact grouting is achieved; the airtightness of the outer well wall can be greatly improved after grouting, water pressure does not directly act on the inner well wall after the freezing wall is melted, and thus the stress condition of the inner well wall and the outer well wall is greatly improved; and construction is easy and convenient, the cost performance is high, the water sealing effect is remarkable, and the construction period is shortened.