Disclosed is an electrical auxiliary demoulding mechanism for a plastic cover mould. The plastic cover mould comprises a mould cavity and a mould core. The mould core comprises cover bottom mould corebodies. Upper tooth rings are made on the top faces of the cover bottom mould core bodies and engaged with lower tooth rings at the bottoms of plastic covers mutually; the bottom faces of the cover bottom mould core bodies make contact with a mould core cushion plate through push-out springs mutually; through holes are made in the cover bottom mould core bodies, and thread core rods are installedin the through holes; bearings are installed between the thread core rods and the mould core cushion plate; and first gears are installed outside the thread core rods and connected with a transmission mechanism driven by an oil motor. The electrical auxiliary demoulding mechanism for the plastic cover mould is characterized in that a limiting block is installed on one side of the mould core cushion plate; a stroke switch and a push-out air cylinder are installed on the cover bottom mould core body located on the same side of the limiting block; a roller of the stroke switch makes contact withthe limiting block mutually; a control circuit is arranged between the stroke switch and the push-out air cylinder; and a piston rod of the push-out air cylinder makes contact with the side wall of the corresponding plastic cover mutually. According to the scheme, automatic demoulding can be achieved, the working efficiency is high, labor intensity is low, and the quality of an inner thread of each plastic cover is good.