A slim OLED lamp is provided, which may include a lamp holder, a support, and a base. The support connects the base to the lamp holder. When the lamp holder, support, and base are folded to be in the same plane, the lamp holder, the support, and the base can be close to and adjacent to one another. A light-emitting unit manufactured by the organic light-emitting technology can be plugged into the lamp holder, so the light-emitting unit can be conveniently replaced. There is at least one rotation direction between the support and lamp holder, so the freedom degree of the illumination range of the light-emitting unit can be increased. The base includes a control unit applicable to various light-emitting units with different rating currents so as to adjust the brightness thereof.