The invention relates to the technical field of soft soil layer foundation pits, and discloses a soft soil layer slope along a foundation pit. The soft soil layer slope comprises a plurality of steel plate piles vertically arranged in the soft soil layer slope, the multiple steel plate piles are erected side by side to form a steel plate wall, the steel plate wall is arranged in the length direction of a slope face platform, the upper end of the steel plate wall extends on the slope face platform, the lower end of the steel plate wall extends to the position below a potential sliding face, and the steel plate wall is used for foundation pit supporting; in this way, the shear strength of the foundation pit soft soil layer slope is improved, the anti-sliding stability of the foundation pit soft soil layer slope is increased, and meanwhile, the construction is convenient and rapid; and after a foundation pit supporting project is completed, when backfilling is started, the steel sheet piles can be lifted and recovered to be reused, the engineering investment is greatly saved, and going green and environmental protection are achieved.