The invention discloses a three-posture position conversion wheelchair which comprises a bottom support, a seat support, a backrest support, a leg bracket, a stand driving mechanism, a plane-on driving mechanism and the like. The three-posture position conversion wheelchair is suitable for the disabled suffering from standing and walking dysfunction, can help a user to perform position transformation among three main postures of lying, standing and sitting, enlarges activity space of the user, improves self-care ability of the user, and simultaneously can effectively avoid amyotrophy, muscular death, joint dedeneration, poor blood circulation, intestines and stomach digestive disease and the like caused by the fact that the user sits for a long time when a common wheelchair is used.