To exploit novel ferrocene-based small molecules with long conjugated structures as visible and electrochemical multichannel chemosensors, four conjugated ferrocene ethynyl semicarbazide derivatives (Fc-X-An) were synthesized via the Sonogashira coupling reaction. The synthesized Fc-X-Ans are 2-(4-(ferrocenylethynyl)benzylidene) hydrazine-1-carboxamide (Fc-Ph-An), 2-((5-(ferrocenylethynyl)thiophen-2-yl)methylene)hydrazine-1-carboxamide (Fc-Thie-An), 2-((9-ethyl-6-(ferrocenylethynyl)-9H-carbazol-3-yl) methylene)hydrazine-1-carboxamide (Fc-Cz-An) and 2-((10-ethyl-7-(ferrocenylethynyl)-10H-phenothiazin-3-yl) methylene)hydrazine-1-carboxamide (Fc-PTZ-An). The recognition abilities of the semicarbazide derivative Fc-X-Ans for several anions were evaluated from visible absorption spectra, 1H NMR, and electrochemical technique.