The invention belongs to the field of tunnel shaft secondary lining construction and relates to a sliding formwork system operation platform for a tunnel shaft lining and a mounting method of the sliding formwork system operation platform. The sliding formwork system operation platform comprises a lifting portal frame and lifting parts arranged at the ends of the portal frame; the lifting parts comprise fixing beams and sliding formwork system operation platform lower crossbeams connected with the fixing beams; the sliding formwork system operation platform further comprises sliding formworksfixedly arranged on the fixing beams; the sliding formworks are fixedly arranged on the fixing beams through supporting beams; sliding formwork operation platform diagonal bracings are further arranged between the fixing beams and the sliding formwork system operation platform lower crossbeams; and the sliding formwork system operation platform further comprises concrete plastering operation platforms arranged at the ends of the sliding formwork system operation platform lower crossbeams and the fixing beams through hanging bars on the two sides. Through inspection in the construction process,a rectangular shaft is constructed through the sliding formworks, so that the construction effect is effectively improved, and construction joints generated by pouring concrete in a layering mode andwaterproof materials needed by the construction joints are omitted; and the overall waterproof quality of the concrete is improved, and the problem of construction joint staggering tables between formwork joints is reduced.