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1. A thermal insulation backpack, characterized in that the backpack comprises a main body and one or more adapter assemblies, wherein the main body is internally provided with a thermal insulation accommodation cavity; connection holes are formed in the main body and are communicated with the thermal insulation accommodation cavity; each adapter assembly is inserted into a respective connection hole, and comprises a fixing frame, a sealing screen, and a reset assembly; the fixing frame comprises a frame body that presses against the respective connection hole and hooks which are connected inside the frame body, at least one hook is connected with the reset assembly, an outer periphery of the sealing screen is provided with a sealing strip protruding outward; a connection recess and a first through slot are formed in the frame body with the at least one hook arranged on an inner wall of the through slot; the first through slot is connected with the thermal insulation accommodation cavity; the sealing screen is connected with the reset assembly; when the adapter assembly is connected with an external cooling apparatus, the sealing screen moves to be close to an inside of the thermal insulation accommodation cavity, so that the connection recess is communicated with the first through slot; when the adapter assembly is not connected with the external cooling apparatus, the sealing screen moves away from the inside of the thermal insulation accommodation cavity; and the sealing strip presses against a lower end of the connection recess to avoid communication between the connection recess and the first through slot.
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