The invention discloses a back supporting and standing assisting device. The device comprises rear wheels, a mounting box, a supporting and standing assisting mechanism mounted on a rack, the rack, abackrest, a seat fixed to the rack, a front wheel support, front wheels, a moving motor and an auxiliary motor, wherein the supporting and standing assisting mechanism comprises a first belt wheel, afirst
transmission belt, a second belt wheel, a mounted bearing, a first shaft, a third belt wheel, a third
transmission belt, a fourth belt wheel, a fifth belt wheel, a second shaft, a third
transmission belt, a first rod, a third shaft, a sixth belt wheel, a second rod, a fourth shaft, a special-shaped connecting rod, a rolling wheel and a fifth shaft. During use, the supporting and standing assisting mechanism is driven by the motors and is driven by the belt wheels, the transmission belts and the connecting rod, so that the supporting and standing assisting mechanism does
reciprocating motion according to a preset track to assist a patient in standing and sitting; and the device integrates the functions of assisting in standing and sitting and riding instead of walking, can be completely and independently operated, and has the advantages of simple structure, light weight, low manufacturing cost, high comfort, ideal auxiliary effect and the like.