The invention relates to a method for reducing powdery manganese dioxide ore to manganese monoxide. A fluidized reduction method for powdery manganese dioxide ore is characterized by comprising the following steps that: 1) the powdery manganese dioxide ore with the particle size less than 1.0 millimeter is preheated and then reacts for 5 to 10 seconds in a suspended state, at a temperature between 750 and 950 DEG C, in a reducing atmosphere and at the solid-gas ratio between 0.6 and 1.0 kg/Nm<3> to form roasted substances, wherein the reducing atmosphere is a gas containing CO, and the volumecontent of the CO in the gas is between 4.5 and 6.5 percent; and 2) the roasted substances is subjected to low-intensity magnetic separation so as to separate out iron ore concentrate byproducts and prepare manganese monoxide as a reduction product. The method has the advantages of low cost and high conversion rate.