Provided is a pedal system that can adjust control pedals on the basis of driver's physical conditions. The adjustable pedal system includes a support bracket that includes a guide groove formed in a substantially vertical direction and a predetermined hole, and is connected to a vehicle; a linear actuator that includes a drive arm linearly movable in a substantially vertical direction and applies a driving force to the drive arm; and a pedal arm. The pedal arm has a hinge hole that is connected to the drive arm by a first pin, a sliding slot that is connected to the predetermined hole by a second pin and is formed to be inclined with respect to the guide groove, and a pedal. The hinge hole is connected to the drive arm by a first pin, and the sliding slot is connected to the predetermined hole by a second pin and is formed to be inclined with respect to the guide groove. In this case, the portion of the pedal arm near the sliding slot slides with respect to the second pin, so that the position of the pedal arm can change.