Subway shield construction technology in sandy soil

The invention relates to the technical field of subway tunnel shield construction, in particular to a subway shield construction technology in sandy soil. The subway shield construction technology inthe sandy soil comprises the following construction measures that sandy soil improvement is carried out, specifically, when a shield tunneling machine carries out tunneling, improvement seriflux is added into the front face of the shield tunneling machine for improving the sandy soil; strengthening grouting is carried out, specifically, hardness seriflux is synchronously added into gaps between atunnel and a shield construction shell body; shield tail strengthening is carried out, specifically, shield tail grease is subjected to pressing grouting uniformly according to procedures of the grease pressing grouting; the density of the hardness seriflux is larger than the density of an upper part sandy soil layer of the shield construction; and the density of the improvement seriflux is smaller than the density of the