The invention provides an assembled aluminium alloy scaffold maintenance platform used for a hydropower station unit. The cross section of the maintenance platform is in the shape of a regular hexagon; the maintenance platform comprises vertical bracing frames, crossbeams, a pedal and guardrails; six vertical bracing frames are arranged, and form a rectangular framework structure, and each vertical bracing frame comprises an inner vertical bar, an outer vertical bar, and cross bars connected between the inner vertical bar and the outer vertical bar; each crossbeam is fixedly connected between two adjacent vertical bracing frames, and the crossbeams connect and fix the vertical bracing frames to form a regular hexagonal prism framework structure; six guardrails are arranged, two sides of each guardrail are provided with spring locks, each guardrail is installed on the extension positions of the tops of two adjacent outer vertical bars, and the six guardrails form a regular hexagon together. The assembled aluminium alloy scaffold maintenance platform gives consideration to flexibility and safety of maintenance work, and is humanized in design, the maintenance efficiency is improved, and the safety of maintenance workers can be well guaranteed.