The invention discloses a booster air-float oxidation furnace. A furnace body (6) of the oxidation furnace is a shell which can bear pressure; the furnace body (6) is provided with a furnace hearth (11) inside; a furnace hearth wall is provided with a heating element (12) inside; the top and the bottom of the furnace hearth (11) are ventilate; a gap is reserved between the top of the furnace hearth (11) and the furnace body (6); the upper part of the top of the furnace hearth (11) is provided with a fan impeller (3); the fan impeller (3) is connected with a speed regulating motor (1) arrangedoutside the furnace body; two sides of the fan impeller (3) are provided with gas-guide tubes (5); a high-pressure air inlet pipe (9) enters the furnace body through one side of the furnace body (6);and an outer section end of the air inlet pipe (9) is provided with a valve (8). Through increasing the gas pressure of the furnace body, circular airflow is formed inside and outside the furnace hearth, reaction alloy powder can be fully contacted with oxygen under high-pressure and suspension state, thereby greatly increasing the oxidation effect and enduring the alloy powder is not attached tothe wall for hardness.