A connecting pipeline (300) of an evaporator (200), the evaporator (200), and a refrigerator. The connecting pipeline (300) of the evaporator (200) is connected to a refrigerant inlet (200) of the evaporator, and comprises a first pipeline (301), a second pipeline (302) and an inlet pipeline (203) connected in sequence, wherein the inlet pipeline (203) is connected to the refrigerant inlet, and the inner diameter of the first pipeline (203) is greater than the inner diameter of the second pipeline (302). The connecting pipeline (300) of the evaporator (200) is configured to comprise a first pipeline (301), a second pipeline (302) and an inlet pipeline (203) connected in sequence, the inlet pipeline (203) is connected to the refrigerant inlet, and the inner diameter of the first pipeline (301) is greater than the inner diameter of the second pipeline (302), such that noise can be effectively reduced.