A health-promoting insole includes steps of processing as follows. First, bamboo charcoal powder in a percentage of 5% is mixed with 95% of filament fibers before the mixture thereof is closely knitted and drawn into an upper layer with a plurality of hollow support rings densely arranged at the upper surface thereon. Then, bamboo vinegar juice and bamboo charcoal powder in a ratio of 1 to 2 are mixed up and heated dry in 48 hours before foaming material (especially EVA or PU) in a percentage of 5 to 10% is added therein and further processed into a bottom layer of a proper thickness. Finally, the upper and bottom layers are mutually bound together via fastening agent and pressed into insoles of various sizes and shoe shapes. Via the bamboo charcoal powder added at the upper and bottom layers therein, the insole thereof is equipped with strong absorbing and decomposing capabilities as well as anti-bacteria, humid-adjustment, and deodorization effects. Besides, far-infrared radiation proper for the absorption of human body is generated to speed up blood circulation and improve the health of human body, and healthy negative ions is increased in the air to balance the humidity at the interior of shoes and prevent bugs therein, efficiently promoting the quality of the insole thereof to achieve better deodorization and anti-bacteria effects thereof.