The invention provides a multi-layer construction basket. The multi-layer construction basket comprises a support, at least two layers of work platforms are arranged on the support, a work ladder is arranged between the work platforms, and abutting-against wheels used for sliding along a building are arranged on the back face of the support. Telescopic work platforms movably connected with the work platforms are arranged at the two ends of the work platforms and used for stretching into gate slots to conduct construction. The construction scheme that multiple overhanging scaffolds are set up in the construction gate slots to serve as an operation platform in the prior art is replaced by the basket structure provided with the multiple layers of work platforms, labor and material cost for constructing the overhanging scaffolds is reduced, potential safety hazards caused by vertical cross operation are eliminated, the construction efficiency of a gate slot technical structure and civil engineering is improved, dam concrete is poured to the top in advance, and the construction period of the dam major engineering is shortened.