The invention discloses an anchor cable construction method under the condition of a water-rich sand layer, relates to the technical field of building construction, and solves the problems that due tothe fact that a sand layer in the prior art is too high in water content, the high risk phenomenon of water gushing and sand gushing is caused, and consequently the construction risk is increased. According to the technical scheme, the anchor cable construction method under the condition of the water-rich sand layer is characterized by comprising the steps that S1, earth excavation is performed,and an anchor cable hole is positioned; S2, a casing pipe is installed, and the casing pipe is refrigerated before the casing pipe is installed and inserted; S3, rotary drilling of a lead hole is performed, meanwhile, filling of liquid nitrogen for heat absorbing is performed, and nitrogen is sucked out; S4, an anchor cable is installed, and primary grouting is performed; S5, anchor pile construction is performed, and secondary grouting is performed; and S6, the anchor cable is tensioned and locked, and the purposes of decreasing the flowing speed of underground water, lowering the risk of water gushing and sand gushing caused by flowing of the underground water in the construction process and improving the construction safety are achieved.