The present invention relates to a liftable house and a lifting device for carrying the room to move up and down, said room-lifting device includes: a rigid lifting tray (3) for supporting the room; a drive unit for driving rigid lifting tray (3) to move up and down, said drive unit including a plurality of hydraulic cylinders (6) and a hydraulic circuit for operatively driving said hydraulic cylinder, the cylinder rod of said hydraulic cylinder supporting the rigid lifting tray (3) on its bottom surface; a guide unit for guiding the lifting tray (3) to move up and down, said guide unit including a guidepost (2) and a guide wheel in a internal guide channel of said guidepost; a long-term locking unit for positioning the lifting tray (3) along vertical direction in the long term, which including a extendable/retractable member (12) mounted on the lifting tray (3) and a stop (13) provided in the guidepost (2) at various heights to support the extendable/retractable member (12); a control unit for controlling the operation of said lifting drive unit and said long-term locking unit.