Water purifying bottle and water purifying method

The present invention discloses a kind of water purifying bottle and its water purifying method. The water purifying bottle includes an elastic bottle body, a membrane assembly and a non-return valve. The membrane assembly consists of a connecting part connected to the mouth of the elastic bottle body, and a hollow fiber film with at least one end connected to the connecting part. The non-return valve is connected to the elastic bottle body, the bottle mouth or the connecting part. The water purifying method is to purify water through adding different water treating adsorption or exchange filtering material based on the pollutant in the water to be treated. The present invention is suitable for field use to obtain purified water and may be also used in secondary purification of tap water.