Construction method for excavation of foundation pit

The invention discloses a construction method for excavation of a foundation pit, and relates to the field of architectural engineering. A specific implementation mode of the method comprises the steps of dividing a foundation pit excavation project into multiple standard segments, and simultaneously excavating the standard segments from the two ends according to the excavation sequence from the two ends to the middle; in each standard segment excavation process, according to the excavation depth, excavating each standard segment in layers from top to bottom according to the following steps ofsymmetrically excavating the first layer of earthwork through excavators arranged on the two sides of the foundation pit, and meanwhile, arranging a foundation pit support; after determining that theexcavation of the first layer of earthwork is finished, through the excavators arranged on two sides of the foundation pit, excavating the second layer of earthwork from the middle to the two sides,and meanwhile, arranging a