This invention discloses a method for producing a high accuracy thermistor nanometer powder, which uses the nitrate of Cr, Ni, Mn as raw material. The method comprises the following steps: a,adding citrate, carbowax and ammonia, heating and mixing, hydrolyzing and aggregation to form transparent colloidal solution; b, drying the colloidal solution and getting dried gel, self-igniting the gel and getting the nanometer powder. By said method, the powder has good materiality, and the size of the powder paritcle can reach to 40-60 nanometer, the powder is spinel structure, after burning its size is between 1 and 2 ª–m. The powder can be used repeatedly, and the rate of finished products can reach to 80%. The powder can be used to produce the thermistor with high accuracy B value and good heat resistant property.