Shield grouting slurry, preparation method and construction device thereof

The invention relates to shield grouting slurry, a preparation method and a construction device thereof. The preparation method of the shield grouting slurry comprises the following steps that 30-70 parts of lime, 250-350 parts of fly ash, 80-120 parts of bentonite, 350-550 parts of fine sand and 350-450 parts of water are selected to be mixed and stirred by mass to obtain first mixed slurry; and30-70 parts of lime is selected to be mixed and stirred with the first mixed slurry, and the shield grouting slurry is obtained. Compared with traditional cement-based grout, the shield grouting slurry is high in water-retaining property and dilution resistance, small in percentage of contraction and high in percentage of consolidation; meanwhile, the obtained shield grouting slurry is high in consistency; and the shield grouting slurry can be poured into the gap between a shield tunneling machine body and a soil body through a radial hole of the shield tunneling machine body and can support the soil body quickly and