The invention provides an atypical and cyclic template system for stair flight prefabricating, and solves the problem of longer stair flight manufacturing period of stairs at the construction site. The atypical and cyclic template system for stair flight prefabricating comprises a bottom mold horizontally fixed, a side template and pedal templates vertically placed, and end molds corresponding to two ends of a stair flight; multiple sets of pedal templates are provided; the pedal templates are spliced by two strip-shaped templates perpendicular to each other; all sets of pedal templates are tightly arranged to form a pedal structure of the stair flight; the side templates are plate-shaped structures; all sets of pedal templates are tightly arranged to form a saw tooth-shaped concave-convex structure; fixed parts are respectively arranged in recessed places formed on the outer side surfaces of the pedal templates; and split bolts are arranged between the side templates and the pedal templates. The atypical and cyclic template system for stair flight prefabricating realizes prefabricating of the stair flight at the construction site, and realizes batch production; the batch production of the stair flight can be performed beforehand at the construction site before production of a body structure; the concrete casting and the appearance molding quality can be guaranteed; the labor investment and the material waste can be reduced; and the construction cost is reduced.