The invention relates to a large-sized slide supporter with a core overturning table. The large-sized slide supporter comprises a core overturning table and a support frame. A slide is arranged on the core overturning table. A supporter and a preset screw are disposed in the slide. The supporter is slid according to the positions of core columns and clamps in a transformer, a proper position is selected, automatic lifting is allowed, and a core is fixed very flatly. The supporter can be conveniently added as required during core laminating, the support frame is screwed up, and local droop deformation under great pressure of the core is avoided. After core laminating, when the core is turned and erected, slipping is avoided. Process defects in core manufacture can be eliminated, process level is increased, and product quality is guaranteed. Operation is flexible for constructors, using is convenient, labor intensity is lower, work efficiency is higher, and rework is avoided.