The design of direct drinking water purifier is to improve the water quality of tap water in some areas, so that consumers can quickly and conveniently obtain safe drinking water and provide protection for consumers' health. At the beginning of the design, this product takes into account the environmental protection of the production materials, and the overall use of ABS materials that meet the national environmental protection requirements to ensure the safety of users and recyclable. The direct drinking water purifier is easy to operate. They can be easily installed in different types of faucets in sockets by using only the products provided with the accessories. The installation process is convenient and quick. When in use, just gently toggle the switch, the tap water can be filtered and purified, which is convenient for children and the elderly to operate. It is equipped with a visual window, which can easily identify the use status of the filter element, and can easily replace the filter element to improve the use efficiency.