The invention belongs to the field of daily chemicals and in particular relates to negative ion far infrared toothbrush bristles. The bristles contain 1.5-3 weight parts of negative ion powder and 97-98.5 weight parts of resin raw material, wherein the negative ion powder is one selected from tourmaline powder, monazite, ceramic powder and bian-stone powder, and the resin raw material is polyethylene terephthalate or polyamide. When being used, the bristles can generate negative oxygen ions because of oral temperature and pressure change in tooth brushing, so that the objective of bacterium resisting and killing can be achieved; far infrared light generated by the bristles has great seepage force and radiation force, thereby promoting rise of subcutaneous deep temperature, promoting hemangiectasis, accelerating blood circulation, facilitating removal of accumulating matter in blood vessels and harmful substances in bodies, promoting tissue reviving and enzyme generation and achieving the effects of activating tissue cells, improving the regeneration capacity of tissue, preventing ageing and enhancing an immunization system. Therefore, the bristles can achieve a good oral health care effect.