The utility model provides a deep foundation pit outer supporting structure which comprises an annular retaining wall structure used for achieving the effects of retaining soil and/or stopping water of a foundation pit. Wherein the annular retaining wall structure at least comprises a first retaining wall part, a second retaining wall part and a third retaining wall part, and the first retaining wall part and the third retaining wall part are respectively connected with the second retaining wall part; The first retaining wall part, the second retaining wall part and the third retaining wall part respectively realize soil retaining and/or water stopping in different directions; The supporting structure is located on the outer side of a foundation pit of the annular retaining wall structure.The pull bearing component is respectively connected with the supporting structure and the second retaining wall part; And the pressure bearing component is respectively connected with the supportingstructure, the first retaining wall part and the third retaining wall part. Due to the fact that the structure is simple, the deep foundation pit outer supporting structure is low in manufacturing cost, low in construction difficulty and short in construction period.