The present invention provides a UVB-LED portable auto-tracking light psoriasis therapy device, which is dedicated for treating psoriasis. The device includes: a base body having one end formed thereon a transmission part a light therapy illumination member mounted in the base body and disposed at the transmission part, wherein the light therapy illumination member includes a plurality of light emitting diodes arranged in a matrix form for facing the transmission part and emitting light to the outside of the base body, and a spatial light regulator is further mounted at the top of the transmission part to change the brightness/darkness distribution of the light a camera member mounted on the base body and a database arranged in the base body and electrically connected to the light therapy illumination member and the camera member. The camera member is provided to photograph the psoriasis area to form local comparison data for being correspondingly compared with the data built in the database. In addition, a control unit is mounted in the base body and electrically connected to the database and the light therapy illumination member. After completing the comparison between the database and the comparison data, the control unit further controls the on/off state and illumination range of the plurality of light emitting diodes of the light therapy illumination member according to the information obtained from comparison.本發明一種UVB-LED可攜式自動追蹤光癬治療機,其專用於乾癬的治療,其包括:一基體,其一端具有一透射部;一裝設於基體內並位於透射部之光療照射件,光療照射件係具有複數呈陣列排序之發光二極體朝透射部透射出基體,而在透射部頂端進一步裝設有空間光調製器改變光線之亮暗分佈;一裝設於基體上之攝像件;一資料庫,其設置於基體內並與光療照射件、攝像件電性連接,攝像件係拍攝乾癬處形成區域比對資料與資料庫內建之資料進行對照比較,另設有控制單元裝設於基體內,又控制單元係與資料庫、光療照射件電性連接,資料庫與比對資料比對完成後,控制單元根據比對完成的資訊進一步控制光療照射件之複數發光二極體的亮滅及照射範圍。(10)‧‧‧乾癬(20)‧‧‧外部接收單元(1)‧‧‧基體(11)‧‧‧透射部(12)‧‧‧空間光調製器(2)‧‧‧光療照射件(21)‧‧‧發光二極體(22)‧‧‧修復燈(3)‧‧‧攝像件(4)‧‧‧資料庫(5)‧‧‧區域比對資料(6)‧‧‧控制單元(7)‧‧‧反射杯(8)‧‧‧傳輸單元