Abstract: The present invention relates to a process for obtaining agar-agar that can be solubilized quickly in water at a temperature higher than its gelling temperature. It consists of using the classical agar-agar in the form of dried powder or dehydrated agar gel granules obtained after the operation of mechanical pressing or of freeze-thawing, to pass through a single-screw or twin screw extruder in mixture with water principally and other products such as the Locust Been Gum, the Guar Gum, Sugar, Peptones . . . or dispersants like the Metarine, fatty acids or organic silicones. Such process allows to produce at a reduced price, an agar-agar with properties of instantaneous dissolution in hot water at a temperature higher than its gelling temperature.