Multi-branch-pore ground pre-grouting and water plugging construction method

The invention relates to a multi-branch-pore ground pre-grouting and water plugging construction method. The method comprises the following specific construction steps: flattening a ground field and mounting a drilling machine; opening a main pore and drilling to an appointed position by utilizing a controlled directional drilling technology; mounting a grouting station on the ground and preparing slurry; grouting a drilled grouting section through a grouting pump; after grouting of the main pore is qualified, sealing the pore to the depth of a construction branch-pore position by utilizing condensed slurry including single cement slurry and the like; after the condensation strength of the slurry meets the requirements, drilling into a pre-set position for grouting by utilizing the directional drilling technology according to a designed branch-pore track; and constructing a plurality of branch pores on one main pore according to engineering requirements. According to the multi-branch-pore ground pre-grouting