Underground continuous wall and construction method thereof

The invention relates to an underground continuous wall, comprising an underground continuous wall guiding wall, a reinforcement cage lifting system, a movable safety protection device and a notch auxiliary steel frame; the underground continuous wall guiding wall comprises a guiding wall, opposite supporting plates, an anti-floating limiting key, a limiting plate and transverse opposite supporting rods; the reinforcement cage lifting system comprises a reinforcement cage, a lifting ring and a lifting appliance; the movable safety protection device comprises a wheel, a support rod, a protective net, a protective mesh clamp net, a diagonal bracing, a sliding groove, a sliding rail, a bolt hole, an upper splice plate and a lower splice plate; the notch auxiliary steel frame comprises a sliderail, profile steel, a sliding wheel, an anti-floating roof, a chute, a steel frame diagonal bracing and a top plate. The underground continuous wall has the beneficial effects that a designed guiding wall inner side strut c