The utility model discloses a special repair dismounting working platform for a capacitor. The special repair dismounting working platform comprises a portal, wherein an underframe is arranged at the lower end of the portal and is provided with a universal wheel, the portal is provided with a fixed frame and is matched with the fixed frame through a guide rail pair in a sliding way, the fixed frame is connected with a piston rod of a lifting hydraulic cylinder, a cylinder body of the lifting hydraulic cylinder is installed on the portal, and the fixed frame is provided with two object supporting frames and is matched with the two object supporting frames in a sliding way. The special repair dismounting working platform is manually controlled by adopting a hydraulic principle, so that the six degrees of freedom motion of lifting up and down, shrinking, expanding, forward moving and back moving of the object supporting frames are realized, the time and the labor are saved, the working efficiency is improved, and the problems that the time and the labor for dismounting and installation are consumed during repairing of the capacitor in an assembling type reactive power optimization device of a transformer substation can be solved.