The invention discloses an infrared image fixed pattern noise suppression and evaluation method. According to the method, a continuous multi-frame full-screen numerical value matrix under a pluralityof different black body temperatures is obtained; average time domain noises and fixed pattern noises under the plurality of different black body temperatures are calculated; fixed pattern noise modedistributions under the plurality of different black body temperatures are calculated; and the fixed pattern noise mode distributions are adopted to modify a temperature lookup table, and the modifiedtemperature lookup table is rewritten into an infrared thermal imager, so that the fixed pattern noises of the infrared thermal imager can be suppressed. According to the method, existing productionequipment and processes are utilized; the temperature matrix data are collected and calculated; the time domain noises and fixed pattern noises are separated from each other; corresponding offset parameters in the temperature lookup table are modified; and therefore, the fixed pattern noises can be suppressed, and an infrared image display effect can be enhanced. The method has the advantages of simplicity, high efficiency and small calculation amount, and can be applied to the production process of products and improve the quality of the products.