An air-cooled refrigerator, comprising: a bottom liner, defining a cooling chamber and a storage space, the cooling chamber being provided below the storage space; a fan bottom shell, provided at a rear portion of the cooling chamber; and an air duct cover plate, comprising: a back plate portion, provided in front of a rear wall of the bottom liner, and defining an air supply duct together with the rear wall of the bottom liner, at least one air supply outlet being formed in the back plate portion, and the air supply outlet being configured to make the air supply duct communicate with the storage space; and a fan upper cover, obliquely extending downwards from a lower end of the back plate portion into the cooling chamber, covering the fan bottom shell and being fastened thereto to form, together with the fan bottom shell, a fan cavity for accommodating fan blades, the back plate portion and the fan upper cover being integrally formed; the air-cooled refrigerator further comprising: the fan blades, provided inside the fan cavity, and enabling formation of a refrigeration air flow discharged from the cooling chamber to the air supply duct, characterized by the refrigerator further comprising: a longitudinal partition, vertically provided in a middle of the storage space to separate the storage space into two transversely-arranged storage cavities; and a back fixing assembly, provided on the rear wall of the bottom liner, and having a supporting block facing the storage space to support the longitudinal partition by using the supporting block. a bottom liner, defining a cooling chamber and a storage space, the cooling chamber being provided below the storage space; a fan bottom shell, provided at a rear portion of the cooling chamber; and an air duct cover plate, comprising: a back plate portion, provided in front of a rear wall of the bottom liner, and defining an air supply duct together with the rear wall of the bottom liner, at least one air supply outlet being formed in the back plate portion, and the air supply outlet being configured to make the air supply duct communicate with the storage space; and a fan upper cover, obliquely extending downwards from a lower end of the back plate portion into the cooling chamber, covering the fan bottom shell and being fastened thereto to form, together with the fan bottom shell, a fan cavity for accommodating fan blades, the back plate portion and the fan upper cover being integrally formed; the air-cooled refrigerator further comprising: the fan blades, provided inside the fan cavity, and enabling formation of a refrigeration air flow discharged from the cooling chamber to the air supply duct, characterized by the refrigerator further comprising: a longitudinal partition, vertically provided in a middle of the storage space to separate the storage space into two transversely-arranged storage cavities; and a back fixing assembly, provided on the rear wall of the bottom liner, and having a supporting block facing the storage space to support the longitudinal partition by using the supporting block. a back plate portion, provided in front of a rear wall of the bottom liner, and defining an air supply duct together with the rear wall of the bottom liner, at least one air supply outlet being formed in the back plate portion, and the air supply outlet being configured to make the air supply duct communicate with the storage space; and a fan upper cover, obliquely extending downwards from a lower end of the back plate portion into the cooling chamber, covering the fan bottom shell and being fastened thereto to form, together with the fan bottom shell, a fan cavity for accommodating fan blades, the back plate portion and the fan upper cover being integrally formed; the air-cooled refrigerator further comprising: the fan blades, provided inside the fan cavity, and enabling formation of a refrigeration air flow discharged from the cooling chamber to the air supply duct, characterized by the refrigerator further comprising: a longitudinal partition, vertically provided in a middle of the storage space to separate the storage space into two transversely-arranged storage cavities; and a back fixing assembly, provided on the rear wall of the bottom liner, and having a supporting block facing the storage space to support the longitudinal partition by using the supporting block. a longitudinal partition, vertically provided in a middle of the storage space to separate the storage space into two transversely-arranged storage cavities; and a back fixing assembly, provided on the rear wall of the bottom liner, and having a supporting block facing the storage space to support the longitudinal partition by using the supporting block.