A balance training apparatus includes a base and a driving device is connected to the base so as to drive a seat portion in different axes. The driving device has a power source, a swing portion, an active portion driven by the power source and a passive portion which is driven by the active portion. The active portion has a first axle which is driven by the power source of the driving device and cooperated with two eccentric wheels. The passive portion has a second axle which includes a straight section and two crank portions are connected to two ends of the straight section. The two distal ends of the two crank portions are rotatably engaged with the first and second blocks on the base. The active and passive portions drive the seat portion to simulate a horse-riding motion.