Outdoor heat preservation bag capable of being assembled

An outdoor heat preservation bag capable of being assembled structurally comprises a first heat preservation bag body and a second heat preservation bag body, the first heat preservation bag body is arranged at the upper end of the second heat preservation bag body, the top of the first heat preservation bag body is connected with a first sealing cover through a zipper, and the top of the second heat preservation bag body is connected with a second sealing cover through a zipper. When the outdoor heat preservation bag is used, two outdoor heat preservation bags are stacked together, the two outdoor heat preservation bags are assembled into the positioning grooves along with the positioning pads to be positioned, then the front buckles are buckled into the buckling pieces, the back hook-and-loop fastener rough surface bonding belts are bonded to the hook-and-loop fastener thorn surfaces, and then fixed connection work of the two outdoor heat preservation bags can be completed; and then, the portable belt can b