The invention discloses a volume-adjustable luggage which comprises a fixed box body, a movable box body, a fixed sleeve, a drawing
handle, a movable box door, a solar charging device, a box
door handle, a coded lock, a control panel, a
liquid crystal display screen, a box
body volume adjusting device, a hydraulic rod, a supporting plate, a hinging piece and universal wheels; the box
body volume adjusting device comprises a first movable groove, a motor, a
threaded rod, a connecting block, a connecting column, a sliding groove, a sliding block, a second movable groove, a fixing base, a buffer spring for fixing, a supporting piece, an inserting opening, an inserting buckle, a pull ring and a rolling wheel. The invention belongs to the technical field of bags and suitcases, and particularly relates to a volume-adjustable luggage, which effectively overcomes the defects of simple structure and simple function of a common bag in the current market, ensures the basic bearing requirement, can change the capacity and the volume, is convenient for people to store and manage, and is a very practical volume-adjustable luggage.