The invention discloses a composite conductive fiber with a special-shaped cross section, a preparation method of the fiber, an antistatic fabric and a discharge method of the antistatic fabric, and belongs to the technical field of spinning. The composite conductive fiber comprises a base body component and conductive components, the cross section of the base body component is in a polygonal shape or multilobal shape, and the conductive components exist at the apexes of the polygonal shape or the apexes of the multilobal shape. The preparation method comprises the steps that the base body component and the conductive components in the composite conductive fiber are fused and blended to form a blended material; the blended material is subjected to composite spinning on a two-component spinning machine to obtain the special-shaped cross-section composite conductive fiber. The antistatic fabric comprises the composite conductive fiber with the special-shaped cross section. The dischargemethod comprises the steps that under the function of an electric field, static charges generated by the antistatic fabric are migrated through the conductive components and gradually gather at the apexes of the polygonal shape or the apexes of the multilobal shape, the field intensity of the electric field is increased, and when the field intensity of the electric field is increased to the discharge intensity, discharge is conducted at the apexes of the polygonal shape or the apexes of the multilobal shape.