An underground soil retaining wall structure for large-scale activity space securement and a construction method thereof are provided to increase rigidity of a soil retaining wall from preloading and to reduce the number of struts by adjusting length of a horizontal beam of truss supports. An underground soil retaining wall structure for large-scale activity space securement comprises outer piles(12) and center pile groups(14), mold support beams, mold beams, deck plates, piece brackets, preloading jacks(26), struts, bracings(52), soil retaining plates, wales, preloading wales(34), and truss supports(36). The outer piles and the center pile groups are installed in a ground(10). The preloading jacks are installed at the mold support beam vertically crossed to the mold support beam. The bracings are crossed to the struts. The preloading wales are fixed at the wales. The truss supports are fixed between the preloading wales and the center pile groups respectively.
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