A cold end heat exchanging device for a semiconductor refrigerator, comprising: a cold end heat exchanging part which defines an inner cavity or pipeline for containing a refrigerant existing in both gas and liquid phases and is configured to allow the refrigerant to flow therein and undergo phase-change heat exchange; and a plurality of refrigerant pipelines configured to allow the refrigerant to flow therein and undergo phase-change heat exchange, each of the refrigerant pipelines being provided with: an evaporation section which is bent to point in a first direction and extends in a plane and has a closed tail end, and a connection section which is bent to point in a second direction opposite to the first direction and extends from a starting end of the evaporation section and is connected to the inner cavity or pipeline; and the evaporation sections of at least some of the plurality of refrigerant pipelines being arranged in two planes which are perpendicular to each other; wherein the evaporation section of each of the refrigerant pipelines comprises: a plurality of straight pipe segments disposed in the first direction at intervals, each of the straight pipe segments being arranged obliquely at an angle of 10° to 70° with respect to a reference plane perpendicular to the first direction; and bent segments, each connecting two adjacent straight pipe segments; characterized in that the cold end heat exchanging device further comprises: a plurality of retention steel wires disposed in the first direction; and a pipe wall at an outer vertex of each of the bent segments on the same side of each of the refrigerant pipelines is welded to one of the retention steel wires. a cold end heat exchanging part which defines an inner cavity or pipeline for containing a refrigerant existing in both gas and liquid phases and is configured to allow the refrigerant to flow therein and undergo phase-change heat exchange; and a plurality of refrigerant pipelines configured to allow the refrigerant to flow therein and undergo phase-change heat exchange, each of the refrigerant pipelines being provided with: an evaporation section which is bent to point in a first direction and extends in a plane and has a closed tail end, and a connection section which is bent to point in a second direction opposite to the first direction and extends from a starting end of the evaporation section and is connected to the inner cavity or pipeline; and the evaporation sections of at least some of the plurality of refrigerant pipelines being arranged in two planes which are perpendicular to each other; wherein the evaporation section of each of the refrigerant pipelines comprises: a plurality of straight pipe segments disposed in the first direction at intervals, each of the straight pipe segments being arranged obliquely at an angle of 10° to 70° with respect to a reference plane perpendicular to the first direction; and bent segments, each connecting two adjacent straight pipe segments; characterized in that the cold end heat exchanging device further comprises: a plurality of retention steel wires disposed in the first direction; and a pipe wall at an outer vertex of each of the bent segments on the same side of each of the refrigerant pipelines is welded to one of the retention steel wires. a plurality of straight pipe segments disposed in the first direction at intervals, each of the straight pipe segments being arranged obliquely at an angle of 10° to 70° with respect to a reference plane perpendicular to the first direction; and bent segments, each connecting two adjacent straight pipe segments; characterized in that the cold end heat exchanging device further comprises: a plurality of retention steel wires disposed in the first direction; and a pipe wall at an outer vertex of each of the bent segments on the same side of each of the refrigerant pipelines is welded to one of the retention steel wires. a plurality of retention steel wires disposed in the first direction; and a pipe wall at an outer vertex of each of the bent segments on the same side of each of the refrigerant pipelines is welded to one of the retention steel wires.