The present invention provides a semiconductor refrigerator, which comprises: a liner; at least one semiconductor cooler; and a plurality of cold end heat exchanging devices, each of which is configured to allow the refrigerant to flow therein and undergo phase-change heat exchange to transfer cold from the cold end of the semiconductor cooler to the storage compartment of the liner. Each of the cold end heat exchanging devices has three refrigerant pipelines, each refrigerant pipeline having an evaporation section which is downwardly bent and extends in a vertical plane and has a closed tail end, the evaporation sections of the three refrigerant pipelines of each of the cold end heat exchanging devices being thermally connected to the rear wall and two side walls of the liner respectively. Energy efficiency of the semiconductor refrigerator is improved significantly.