The invention relates to an automatic adjusting device for testing and exercising balance capacity of elderly patients, which comprises a bottom plate, four first guide grooves are formed in the top of the bottom plate, first guide blocks are slidably connected in the first guide grooves, first springs are fixed between the first guide blocks and the side walls of the first guide grooves, and supporting rods are rotatably connected to the tops of the first guide blocks. An I-shaped frame is fixed to the top of the bottom plate, the I-shaped frame is sleeved with a connecting base, the connecting base and the standing plate are fixed, a water collecting box is fixed to the bottom of the standing plate, first openings are formed in the two sides of the water collecting box, push rods are inserted into the first openings, and push plates are fixed to the sides, close to the water collecting box, of the push rods; an embedding groove is formed in the side, away from the water collecting tank, of the front end of the push rod, a reset spring is fixed to the side wall of the embedding groove, a movable rod is fixed to the other side of the reset spring, and a limiting frame fixedly sleeves the push rod; wobbling of the whole standing plate is accelerated through shaking of water flow, and therefore exercise stimulation on a patient is improved.