A light therapy device includes a base, a circuit board, a power supply unitand alid. The base includes a bottom surface, wherein a first accommodating spaceisformed in the base. The circuit board is disposed in the first accommodatingspace.The circuit board includes a lighting unit and an electrode set electricallyconnected tothe lighting unit, in which the lighting unit emits light toward the bottomsurface. Thepower supply unit is electrically connected to the electrode set. The lid hasa secondaccommodating space for accommodating the power supply unit, in which thesecondaccommodating space is eccentrically rotated relative to the firstaccommodating spacefor eccentrically rotating and switching the power supply unit to be conductedornon-conducted with the electrode set, thereby turning on or off the lightingunit.
