The invention relates to the technical field of municipal engineering, in particular to a safety ladder capable of being folded and assembled. The safety ladder capable of being folded and assembled comprises a plurality of folding units, wherein the folding units are each composed of a plurality of ladder beams, the multiple folding units are rigidly connected to form a ladder beam part, then a handrail part is assembled on the ladder beam part, fixing seats are fixed to the upper end and the lower end of the ladder beam part, and the ladder beam part is fixed into a groove. The safety laddercan select the assembled modulus and inclined angle, has universality, can be folded and split, and is convenient to transport and recycle.