A light emitting diode luminaire compatible for both top mounting and wall mounting comprises a mounting adapter body suitable to top mounting and wall mounting of the luminaire, a power source for power supply to the luminaire, a radiator, a light source plate, a sucking plate and/or an arm; the mounting adapter body comprises a mounting adapter bracket centered thereof, the mounting adapter bracket can not only be connected to the sucking plate but also connected to the arm. Under the cooperation between the long striped mounting adapter body and the sucking plate and/or arm, the same luminaire can be applicable to a variety of different ways of mounting, with only a few components rather than a complete set of components changed. Thus, not only the procedure and time of production are simplified, but the production cost is greatly reduced.