The invention discloses an oxygen supply apparatus for rich oxygen gasification of coal. The apparatus comprises a liquid oxygen tank, a jacket, a mobile device, an air carburetor, a silencing device,a pressure meter, a flow meter and an oxygen conveying tube, the jacket is arranged outside the liquid oxygen tank, and the liquid oxygen tank is fixed in the jacket; the mobile device is arranged atthe bottom of the jacket; and the air carburetor is arranged over the liquid oxygen tank, the silencing device is arranged at the right side of the air carburetor, the oxygen conveying tube is arranged at the right end of the silencing device, an electromagnetic throttle valve is arranged in the oxygen conveying tube, the flow meter is arranged at the left side of the electromagnetic throttle valve, and the pressure meter is arranged at the left side of the flow meter. The apparatus a reasonable structure design and a good oxygen supply effect, the oxygen liquid tank can store much oxygen, and the silencing device can effectively adsorb and reduce noises to well improve the operating environment; and the whole apparatus can randomly move through the mobile device, the condition of oxygenin the oxygen conveying tube can be easily known through the pressure meter and the flow meter, and the flow of the oxygen can be momentarily adjusted through the throttle valve.