Prefabricated open cut tunnel and construction method thereof

The invention relates to the technical field of open cut tunnel construction, and discloses a prefabricated open cut tunnel and a construction method thereof. The prefabricated open cut tunnel comprises a foundation platform, side walls and an arch ring; the side walls include an outer side wall, an ear wall and an inner side wall; the inner side wall is formed by arranging hollow side wall prefabricated blocks longitudinally and vertically; the side wall prefabricated blocks include double-opening prefabricated blocks and single-opening prefabricated blocks; the single-opening prefabricated blocks serve as the topmost layer of the inner side wall; the double-opening prefabricated blocks are placed below the single-opening prefabricated blocks; the arch ring is formed by longitudinally arranging arch ring prefabricated blocks; and the arch ring prefabricated blocks are placed above the single-opening prefabricated blocks. The inner side wall and the arch ring of the open cut tunnel are assembled and construct