The invention provides a bicycle protection tool avoiding pollution. Firstly, the bicycle protection tool avoiding pollution is designed into a detachable structure and is formed by connecting a filter base and a filter through a thread. A filter net is arranged at the filter part so that air can be preliminarily subjected to physical purification; an activated carbon filter disc is arranged inside, and accordingly the purposes of air pollution filtering and the like can be finally achieved; a fixing rod is arranged at the middle part of the filter, the filter is detachably arranged, and therefore after the activated carbon filter disc is used for a long time, timely replacement can be achieved; a fixing nut can conveniently and rapidly fix the activated carbon filter disc inside; and by means of the design, air can be efficiently filtered, and the convenient and fast using experience can be brought to users.