A device for treating dysarthrosis includes a first base having one side surface for the heel of a human foot to be attached thereon; a second base having one end disposed on the side surface of the first base and one side surface for the sole of the human foot to be attached thereon; a push portion disposed on the second base and having an abutting surface corresponding in position to an outer side of the first toe of the human foot and configured to abut against an outer side of the first metatarsophalangeal joint of the first toe to be moved between a first position and a second position; and a support portion disposed on the second base and having one end located between the first toe and the second toe of the human foot for abutting against one side of the first toe.