A supporting device is applied to an electronic device and includes a supporting unit, an adjusting unit and a fixing unit. The supporting unit supports the electronic device. The adjusting unit is connected to the supporting unit for adjusting an angle of the supporting unit. The fixing unit includes a locking part and a fixing part. The fixing part is fixed on a surface, and the locking part connects to the adjusting unit. The locking part is detachably locked with the fixing part so as to fixing the electronic device on the surface. The supporting device is advantageous for providing multiple viewing angles for users, and it is conveniently carried and easily assembled, thereby achieving firmly fixing effect.