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Photocatalytic conversion of carbon dioxide (CO 2 ) to liquid product acetaldehyde (CH 3 CHO) remains a great challenge due to the involvement of a complex 10-electron reduction process and a sluggish C-C coupling reaction. Herein, we report the synthesis of Janus silver/ternary silver halide (Ag/AgClBr) nanostructures through precisely manipulating the growth kinetics and its function as a plasmonic photocatalyst to boost the conversion of CO 2 to CH 3 CHO. The obtained Janus nanostructures featuring both spatially separated architecture and broad light-harvesting capability facilitate the photocatalytic reduction of CO 2 under solar illumination. The photocatalytic CO 2 reduction with the characteristics of high activity and good selectivity can generate a 10-electron reduction product CH 3 CHO with a generation rate of 209.3 ± 9.5 μmol h -1 g -1 and a selectivity of 96.9%, which are rarely achieved in previously reported photocatalytic CO 2 reduction systems. The excellent photocatalytic performance can be ascribed to the plasmonic effect of Ag nanocrystals and the favorable active sites on the catalyst surface. This research demonstrates for the first time the utilization of the Janus Ag/AgClBr nanostructures to generate the value-added C 2 liquid product through photocatalytic CO 2 reduction, paving the way for the design and construction of novel plasmonic photocatalysts.