A refrigerator, comprising: a storage compartment; a mixed air passage, whose both ends have air inlets (31,32), whose middle portion comprises a mixed air outlet communicating with the storage compartment, and which is configured to receive air flows from the two air inlets (31,32) such that two air flows enter the storage compartment in a mixed manner via the mixed air outlet; characterized by a mixed air passage cover plate mounted at a top wall of the storage compartment to form the mixed air passage, wherein the mixed air passage extends longitudinally and comprises the air inlets (31,32) at its front and rear ends, wherein the mixed air passage cover plate is mounted on a lower surface of the top wall of the storage compartment, and comprises: a web portion extending upwards from a rear end of the web portion to a front end thereof and comprising a through hole at the center thereof, and an air aperture portion extending downwards in a direction perpendicular with the web portion from an edge of the through hole and having a lower end opening acting as the mixed air outlet, the mixed air outlet is inclined forwards; and a refrigeration air passage, wherein one air inlet (31,32) of the mixed air passage is configured to receive a refrigeration air flow blown from the refrigeration air passage, and another air inlet (31,32) of the mixed air passage communicates with the storage compartment, wherein a refrigeration air passage cover plate mounted at a front surface of a rear wall of the storage compartment to form the refrigeration air passage, and provided with at least one rear air outlet; or a refrigeration air passage cover plate mounted at a rear surface of the rear wall of the storage compartment to form the refrigeration air passage, the rear wall of the storage compartment being provided with at least one rear air outlet, wherein the at least one rear air outlet is configured to blow the refrigeration air flow to the one air inlet (31,32) of the mixed air passage and/or to the storage compartment, and the another air inlet (31,32) of the mixed air passage communicates with a front space of the storage compartment. a storage compartment; a mixed air passage, whose both ends have air inlets (31,32), whose middle portion comprises a mixed air outlet communicating with the storage compartment, and which is configured to receive air flows from the two air inlets (31,32) such that two air flows enter the storage compartment in a mixed manner via the mixed air outlet; characterized by a mixed air passage cover plate mounted at a top wall of the storage compartment to form the mixed air passage, wherein the mixed air passage extends longitudinally and comprises the air inlets (31,32) at its front and rear ends, wherein the mixed air passage cover plate is mounted on a lower surface of the top wall of the storage compartment, and comprises: a web portion extending upwards from a rear end of the web portion to a front end thereof and comprising a through hole at the center thereof, and an air aperture portion extending downwards in a direction perpendicular with the web portion from an edge of the through hole and having a lower end opening acting as the mixed air outlet, the mixed air outlet is inclined forwards; and a refrigeration air passage, wherein one air inlet (31,32) of the mixed air passage is configured to receive a refrigeration air flow blown from the refrigeration air passage, and another air inlet (31,32) of the mixed air passage communicates with the storage compartment, wherein a refrigeration air passage cover plate mounted at a front surface of a rear wall of the storage compartment to form the refrigeration air passage, and provided with at least one rear air outlet; or a refrigeration air passage cover plate mounted at a rear surface of the rear wall of the storage compartment to form the refrigeration air passage, the rear wall of the storage compartment being provided with at least one rear air outlet, wherein the at least one rear air outlet is configured to blow the refrigeration air flow to the one air inlet (31,32) of the mixed air passage and/or to the storage compartment, and the another air inlet (31,32) of the mixed air passage communicates with a front space of the storage compartment.