A walking trainer includes a linear transmission unit including two carriages, and two pedal units each including a pedal holder, which includes a bottom frame carried on one respective carriage, upright posts mounted at the bottom frame and a top block mounted on and movable up and down along the upright posts, a rotary shaft mounted in the top block in a direction perpendicular to the upright posts and a pedal mounted on the rotary shaft and biasable with the rotary shaft relative to the pedal holder. Thus, the pedals of the pedal units can be moved with the respective carriages linearly and alternatively back and forth, on the other hand, and can also be moved with the associating top blocks up and down and biased with the respective rotary shafts relative to the respective pedal holders to simulate the walking gait path.
