The invention relates to the field of ultra-high and extra-high-voltage electrical manufacturing, particularly to a connecting plate for an electric reactor. The connecting plate comprises a bottom plate, a back plate and two side plates which are made from stainless steel; the back plate and the side plates are welded on the bottom plate separately; the two sides of the back plate are perpendicularly welded with the two side plates respectively; four first connecting holes are formed in the bottom plate; and second connecting holes are formed in the back plate and the side plates. The bottom plate is used for connecting the electric reactor body and an insulator while the side plates and the back plate are used for being connected with a star-shaped arm and for reinforcing the connecting plate.