A light therapy device includes a base, a circuit board, a power supply unit and a lid. The base includes a bottom face, and includes a first accommodating space formed therein. The circuit board is disposed in the first accommodating space. The circuit board includes a lighting unit and an electrode set electrically connected to the lighting unit. A light emitted from the lighting unit towards the bottom face. The power supply unit is electrically connected to the electrode set. The lid includes a second accommodating space formed thereon and the power supply unit is disposed in the second accommodating space. The lid is rotatably disposed in the base, and the second accommodating space eccentrically rotates relative to the first accommodating space. Therefore, the power supply unit is eccentrically rotated thus it is selectively contacted with the electrode set； thereby the lighting unit is capable of turning on/off.本發明提供一光療裝置，包含一底座、一電路板、一供電單元以及一蓋體。底座包含一底面，並於其內形成一第一容室。電路板安裝於第一容室內，其包含一發光單元及電性連接發光單元之一電極組，其中發光單元之發光朝向底面。供電單元用以電性連接電極組。蓋體上形成一第二容室供置放供電單元。蓋體可被轉動地容設於底座內，第二容室可相對第一容室偏心旋轉，以帶動供電單元偏心旋轉而切換供電單元與電極組導通與否，進而切換發光單元發光與否。藉此，光療裝置結構簡易，體積輕薄而可隨攜隨用。
