The invention relates to a color-change-resistant anti-bacterial polyamide fiber, which is mainly prepared from polyamide and antibacterial masterbatch according to a weight ratio of 100:(1 to 10), wherein the antibacterial masterbatch is prepared from the following raw materials in parts by weight: 70 to 95 percent of long-carbon-chain nylon and 5 to 30 percent of silver carried ion antibacterialagents; the color-change-resistant anti-bacterial polyamide fiber also contains at least one kind of materials in dispersing agents, antioxidants and light stabilizing agents. The prepared color-change-resistant anti-bacterial polyamide fiber hardly generates color change in the processing and use process; the excellent color-change-resistant performance is realized; in addition, the anti-bacterial performance is stable and durable.