The invention discloses a shield method contact channel assembled negative ring segment overall demolition method which is characterized by including the steps: fixing assembled negative ring segmentssupported by a support system trolley by bolts, axially and fixedly connecting the negative ring segments by steel channels to form an integrated negative ring segment cylinder; forming a movable distance between a recovered rear supporting plate and the side wall of a shield tunnel in the support system trolley; fixedly and integrally connecting the recovered rear supporting plate with the integrated negative ring segment cylinder by the aid of a rigid pull rod, ejecting the rear supporting plate by a cross supporting oil cylinder arranged between a vertical column and a rear supporting plate in the support system trolley, and separating a negative ring segment cylinder from a positive ring segment. According to the method, the negative ring segments are demolished as a whole in the construction process of an assembled contact channel.