The invention discloses a straight-moving self-walking movable three-dimensional garage comprising a berth unit, wherein the berth unit is formed through splicing of berth modules, each berth module comprises n layers of berth supporting plates and four berth retractable supporting columns, each berth supporting plate comprises an inner berth steel plate and an outer berth steel plate, each inner berth steel plate and each outer berth steel plate form a hinge structure, four end angle portions of each inner berth steel plate of each berth supporting plate on each layer are connected with corresponding positions of the four berth retractable supporting columns in a rotary mode, and the berth retractable supporting columns rotate, stretch and retract along with the inner berth steel plates. The technology of modularized installation is adopted, so the straight-moving self-walking movable three-dimensional garage is convenient to detach and transport, and can well meet temporary and sudden parking requirements. A self-moving mode not only increases efficiency of storing and taking of vehicles, but also enables manufacture cost to be lower compared with a mechanical three-dimensional garage. Operation and maintenance expenses of mechanical equipment are saved. Due to the advantage of modularized expansion, the straight-moving self-walking movable three-dimensional garage can well meet field conditions and different parking requirements.