The utility model discloses an anti - washout type water purifier, including water purifier base and water purifier protecting cover, be equipped with water inlet channel and apopore in the water purifier base, install the change -over valve in the water inlet channel, water purifier base lateral part movable mounting has the conversion handle of being connected with the change -over valve, it installs the filter core adapter to correspond the apopore on the water purifier base, the filter core adapter is located in the water purifier protecting cover, the filter core adapter can be dismantled and be connected with the filter membrane filter core, filter membrane filter core outside can be dismantled the cover and buckled the filter core and protect a section of thick bamboo, the filter core protects the tip of a section of thick bamboo and can dismantle and be connected with anti - washing unit, the utility model discloses a food level cleaner is used to the back flush regeneration function of installing anti - washing unit realization filter membrane filter core, cooperation, can high -efficiently clean membrane surface pollution thing rapidly to resume the water flux and the filter fineness of filter membrane filter core, the restoration ratio is up to more than 97%, and very big range ground has prolonged the life of filter membrane filter core with water purification unit. In addition, easy operation, the effect is showing, and it is extensive to be suitable for the field.