The invention relates to a foundation pit support by adopting manually-digging piles to support a foundation pit in construction works, and a construction method for realizing the foundation pit support. The foundation pit support comprises the manually-digging piles. A transversal force transfer object is arranged between two adjacent piles from top to bottom along the lateral wall of the foundation pit at intervals, two ends of the transversal force transfer object are respectively connected in the two adjacent manual digging piles, and meanwhile, the reinforcement assembly mode of a vertical reinforced rib of the manually-digging pile and the shape of the pile bottom are changed. The foundation pit support can increases the distance between piles, reduces the total number of piles and the use amount of single reinforced steel bar, and eliminates unnecessary earth excavation and filling concrete at the bottom of the single pile, thus shortening the whole construction period of the foundation pit and reducing cost.