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This application provides a forced circulation system for a dilution refrigerator, relating to the technical field of mK-level dilution refrigeration. The dilution refrigerator has a shell and a room temperature plate disposed on the upper side of the shell. The shell and the room temperature plate form a vacuum chamber. The vacuum chamber contains pre-cooling stage cold plates and multiple core stage cold plates arranged sequentially in a vertical direction. The forced circulation system includes: a pre-cooling mechanism disposed between the room temperature plate and the pre-cooling stage cold plates and cooling the pre-cooling stage cold plates to a target temperature; a driving mechanism disposed on the room temperature plate and generating a driving force for reciprocating movement in a vertical direction under the action of an external force; and a circulation mechanism disposed on the pre-cooling stage cold plates. The circulation mechanism has two first gas chambers arranged sequentially in a vertical direction. Driven by the driving force, the circulation mechanism alternately compresses the helium in the two first gas chambers in a vertical direction, causing the helium to flow back and forth between the pre-cooling stage cold plates and the multiple core stage cold plates and exchange heat, thereby causing the temperature of the multiple core stage cold plates to reach the target temperature.