The impermeable membrane construction method comprises the following operation steps that S1, selecting an impermeable membrane meeting construction conditions, the impermeable membrane is a polyethylene geomembrane, storing and transporting the impermeable membrane in a winding mode, the length of each roll of impermeable membrane is 90-105 m, wherein the width of each roll of impermeable membrane is 8-10 m; S2, winding the selected anti-seepage membrane, conveying the wound anti-seepage membrane to an appointed position through a crane, binding the crane and the geomembrane through a special membrane hanging belt, and protecting the anti-seepage membrane, and S3, preparing a peelable protective outer membrane which comprises a peelable outer membrane and a peelable adhesive material. According to the impermeable membrane construction method, the peelable protective outer membrane is arranged on the outer surface, the outer surface of the impermeable membrane is protected during construction laying, the abrasion condition is not prone to occurring, a foundation is subjected to reinforcement operation, the surface is ground flat, the construction effect is improved, the impermeable membrane construction method is more stable, and better use prospects are brought.