The invention belongs to liquid predominantly to water purification devices which are used as off line units in household, outdoors, in the village and service departments. Particularly the given invention is in the filed of pressure off-line units.The invention can be used for water purification and other liquids of household use, in medicine and other branches of industry.Liquid purification device, operating under gas pressure and containing raw liquid vessel with the spout, lid, filtration cartridge, purified liquid vessel, output purified liquid means, the gas injection block, connected to raw liquid vessel, and containing gas injection means, control panel and power supply, characterized in that the liquid purification device is capable of at least two stage opening of the lid and the pressure relief down to atmospheric is on the first stage.