The invention discloses formwork equipment applicable to single-section ultra-long wall body high-precision construction and a mounting method thereof. The formwork equipment comprises a right-angledn-shaped steel support system and steel frame bamboo glue forms, wherein the right-angled n-shaped steel support system comprises two end form backing steel frames and a plurality of intermediate formbacking steel frames, the intermediate form backing steel frames are sequentially arranged between the two end form backing steel frames, by means of connecting cross beams, the end form backing steel frames and the intermediate form backing steel frames are connected into a whole through bolts, the appearances of the end form backing steel frames and the intermediate form backing steel frames are both right-angled n-shaped, and the steel frame bamboo glue forms are fixed to the inner end face of a right-angled n-shaped inner side frame of each end form backing steel frame and the inner end faces of right-angled n-shaped inner side frames of the intermediate form backing steel frames correspondingly. According to the formwork equipment applicable to the single-section ultra-long wall high-precision construction and the mounting method thereof, the construction precision is high, the harsh precision requirements of the parallelism being smaller than or equal to 5 mm, the perpendicularity being smaller than or equal to 10 mm, the flatness of the joint being smaller than or equal to 2 mm, smooth transition and the like within the design requirement range of a 400-meter ultra-long pool can be met, and the method is applied to the shipping technology and safety scientific research facility and base construction projects.