The invention provides a splicing sleeve protector mating straightener for large-section conductors. The splicing sleeve protector mating straightener comprises a top beam, a base and stand pillars arranged between the top beam and the base. The top beam and the base are arranged horizontally and the middle axes thereof are located on the same overhang surface. The improvements lie in that support blocks are arranged at intervals vertically upward along the central axis of the base and a push pressing mechanism is arranged vertically downward at the middle portion of the central axis of the top beam. The splicing sleeve protector mating straightener for large-section conductors can automatically straighten bent semi-circular pipes once, simplify the straightening process and greatly improve the straightening accuracy and working efficiency.