An improved desk lamp is disclosed. The improved desk lamp of the present invention comprises a heat dissipating housing, a heat dissipating module, a light unit and a control unit. The heat dissipating module, light unit and control unit are disposed inside the housing. A window is provided at an upper portion on the inner side of the housing. The light unit is disposed on a heat conducting plate of the heat dissipating module and is aligned with the window so that the light radiating from the light unit may go through the window to provide illumination. The heat dissipating module is in contact with an inner wall of the housing. The control unit is connected with the light unit and has a switch, which extends out of the housing and may be used to turn on and turn off the light unit. When the light unit is turned on, the heat generated by the light unit may be absorbed by the heat dissipating module and then be transmitted to the heat dissipating housing so that the heat may be quickly dissipated into the ambient surrounding by the housing.