Modularized assembly expandable container of heavy truck battery swap station

The invention relates to a modular assembly expandable container for a battery swap station of a heavy truck, the modular assembly expandable container is formed by splicing a plurality of block-shaped module structures and forms at least a lower layer space, a middle layer space and an upper layer space, the lower layer space (11) is provided with a charger unit (23) and a control unit, the middle layer space (12) is internally provided with a plurality of battery packs (21), the upper layer space (13) is provided with a rail support (25), and the rail support (25) is connected with the battery pack (21). The travelling crane (3) moves along the track bracket (25) and can grab, move or put down the battery packs (21), so that the charged battery packs (21) in the middle-layer space (12) can be replaced with the battery packs (21) needing to be charged on the heavy truck (5); the multi-layer block-shaped module structure removes part of the lower-layer space (11) and part of the middle-layer space (12) to for